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Boiling Lake

The Boiling Lake is a flooded fumarole located in Morne Trois Pitons National Park, a UNESCO World Heritage Site since 1997 on the Caribbean island of Dominica, at an elevation of approximately 750 meters above the Valley of Desolation volcanic complex.^[1]^[2] This volcano-hydrothermal feature consists of a basin filled with greyish-blue water that perpetually boils due to superheated volcanic gases rising from an underlying magmatic heat source, maintaining surface temperatures of 80–90°C.^[1]^[2] Measuring about 60 meters in diameter and 15 meters deep, it ranks as the second-largest boiling lake globally, after New Zealand's Frying Pan Lake.^[1]^[2] Geologically, the lake occupies a crater formed by phreatic or phreatomagmatic explosions dated to 2,900–4,050 years ago, sustained by a self-contained hydrological system where steam bubbles drive fluid circulation without direct surface inflow or outflow under normal conditions.^[2] The acidic waters (pH 4–6) contain high chlorine levels (~5,000 ppm), reflecting interaction with geothermal fluids from an igneous intrusion below.^[2] First documented by explorers in the 1870s, the lake has exhibited dramatic fluctuations, including "crises" where blockages cause water levels to drop rapidly, followed by refilling over hours to weeks, with notable crises in 1901 (resulting in two fatalities from a gas explosion) and 2004–2005, alongside phreatic eruptions in 1880 and 1997 that affected the area. The lake has continued to exhibit such fluctuations, including level drops in 2023 and 2024.^[1]^[2]^[3] These variations are monitored by the University of the West Indies Seismic Research Centre for insights into regional geothermal and volcanic hazards, though no direct seismic triggers have been confirmed.^[1] Access to the site requires a strenuous 2–3 hour hike through rugged terrain, emphasizing its remote and hazardous nature as a natural geothermal phenomenon.^[1]

Physical Characteristics

Location and Setting

The Boiling Lake is located in Saint Patrick Parish, Dominica, within the Lesser Antilles archipelago of the Caribbean. Its precise geographical coordinates are 15°19′06″N 61°17′39″W. Situated at an elevation of approximately 750 meters above sea level, the lake occupies a remote position in the island's southern highlands.^[2] The site lies entirely within Morne Trois Pitons National Park, a protected area spanning about 6,857 hectares of diverse terrain. This national park was inscribed as a UNESCO World Heritage Site in 1997, recognized for its exceptional natural features including volcanoes, hot springs, and endemic biodiversity.^[4] Dominica's central and southern volcanic landscape provides the broader contextual setting, with the lake embedded in an environment of steep ridges and deep valleys characteristic of the island's geology. Surrounding the Boiling Lake are notable features such as the nearby Valley of Desolation, a stark hydrothermal zone, and peaks like Morne Nicholls, which reaches 966 meters in height.^[1]^[5] The area integrates into a rugged volcanic terrain largely cloaked in tropical rainforest, contributing to the isolation and pristine quality of the site. This positioning underscores the Boiling Lake's role in affirming Dominica's designation as the "Nature Island" of the Caribbean, emphasizing its untouched mountainous wilderness.^[6]

Dimensions and Appearance

The Boiling Lake measures approximately 50 to 60 meters in diameter, with a surface area of about 2,000 square meters, making it the second-largest hot lake globally after Frying Pan Lake in New Zealand, which spans roughly 38,000 square meters.^[1]^[2]^[7] Its depth is estimated at around 15 meters when full, though early measurements from 1875 suggested it exceeded 59 meters; water levels fluctuate significantly due to hydrothermal activity, sometimes dropping by 10 to 15 meters during drainage events before refilling rapidly.^[2]^[1] The lake occupies a flooded fumarole and appears as a basin of superheated, greyish-blue water in constant vigorous convection, producing a perpetual rolling boil and often enveloped in a prominent steam plume that obscures the center.^[1]^[2] Surface temperatures typically range from 82 to 92°C (180 to 197°F) along the edges, with the central upwelling zone reaching even higher values that remain unmeasured due to intense boiling.^[1]^[2] Occasionally, the water shifts from its characteristic blue-grey hue to milky white, attributed to increased mineral suspensions and gas emissions during periods of heightened activity.^[2]

Geological Aspects

Formation and Structure

The Boiling Lake originated as a volcanic crater formed through a phreatic or phreatomagmatic explosive event within the Morne Trois Pitons volcanic complex in southern Dominica.^[8] This explosive activity created a sinkhole-like basin, likely resulting from the interaction of groundwater with rising magmatic gases or partial magma involvement, in a region characterized by active volcanism.^[8] The lake's formation is tied to the broader tectonic setting of the Lesser Antilles arc, where the subduction of the North American Plate beneath the Caribbean Plate at approximately 2 cm per year drives magma generation and geothermal activity over millions of years.^[9] Dominica, as part of this arc, hosts a chain of andesitic volcanoes, with medium-K andesite as the dominant rock type throughout the Pleistocene and Quaternary periods, contributing to the lake's foundational geology.^[9] Structurally, the Boiling Lake occupies a large volcanic crater or caldera-like depression with sub-vertical walls.^[8] It receives surface inflow via a stream on the northern side (~864–2,765 m³/day as measured in 2006), rainwater, groundwater, and ascending hydrothermal fluids that percolate through fractures and faults in the surrounding volcanic rocks, with outflow through a notch on the southern rim into the Rivière Blanche under normal conditions.^[2]^[10] This hydrology sustains water levels 12–15 m above the regional water table, with periodic overflow risks during heavy precipitation or changes in subsurface flow.^[8]^[2] The basin's position near latent volcanic centers, such as those in the Valley of Desolation, underscores its integration into Dominica's active volcanic landscape.^[1] The lake's water chemistry is enriched with volcanic minerals, primarily sulfur and silica, derived from hydrothermal alteration of the surrounding andesitic rocks and gas dissolution.^[8] Sulfur enrichment occurs through the deposition of elemental sulfur and sulfur-bearing minerals like clays in the hydrothermal system, while silica contributes to the precipitation of siliceous deposits around the basin.^[10] These minerals reflect the ongoing influence of magmatic fluids from the subduction-related volcanism, altering the local geology and maintaining the lake's distinct composition.^[8]

Hydrothermal Activity

The Boiling Lake's persistent boiling state results from hydrothermal heating driven by an underlying igneous intrusion, which superheats groundwater to produce steam bubbles that rise through fumarolic vents at the lake bottom. This process induces vigorous convection and maintains surface water temperatures of 80–90°C, with the net volcanic energy input estimated at ~30 MW to sustain the observed dynamics.^[2] The magmatic heat source interacts with circulating meteoric waters, preventing direct contact with molten material while ensuring continuous energy transfer to the lake system.^[2] Surrounding the lake in the Valley of Desolation, a range of hydrothermal features underscores the active geothermal environment, including acid-sulfate hot springs rich in sulfate ions (up to 4200 mg/L) and steaming ground indicative of subsurface boiling. Fumaroles and vents emit volcanic gases dominated by carbon dioxide (492–993 mmol/mol) and hydrogen sulfide (1.5–354 mmol/mol), contributing to the area's characteristic sulfurous odor and atmospheric haze. Boiling mud pools and intermittent hot streams further manifest the near-surface hydrothermal circulation, with pH levels as low as 4 reflecting oxidative reactions involving sulfur species.^[11]^[12] The lake's water balance relies on replenishment from rainfall, surface stream inflow (~864–2,765 m³/day as measured in 2006), and subsurface inflows of cooler meteoric groundwater (around 20°C), which mix with ascending steam to offset intense evaporation and outflow through a notch in the crater rim into the Rivière Blanche. This cycle sustains water depths of 12–15 m above the regional water table. Perturbations in gas flux or structural changes can disrupt this equilibrium, leading to temporary level drops.^[2] Ongoing hydrothermal activity is evident in the lake's surface bubbling patterns, which drive constant upwelling, and prominent steam plumes that can rise tens of meters, signaling robust gas and heat release. These features have remained stable for over 150 years, interrupted by occasional crises involving phreatic eruptions or rapid draining and refilling events, as observed in 2004–2005 when temperatures briefly fell to 20°C due to reduced hydrothermal input, and more recently in 2021 and 2024 with significant water level drops.^[2]^[1]^[8]^[13]^[14] Such indicators highlight the system's sensitivity to deeper magmatic processes without direct ties to regional seismicity.

Historical Context

Discovery and Early Exploration

The first recorded sighting by Europeans took place in 1870, when British colonial officials Edmund Watt and Henry Alfred Alford Nicholls encountered the feature during an exploratory survey of Dominica's mountainous interior.^[15] This initial observation highlighted the lake's remote location amid dense rainforest and steaming volcanic terrain, approximately 750 meters above sea level in what would later be designated the Valley of Desolation.^[16] Five years later, in 1875, Nicholls—by then a prominent physician and naturalist—organized a dedicated expedition to document the lake more thoroughly, joined by government botanist Henry Prestoe and local guides who cleared a path through the rugged terrain.^[17] During this investigation, the team measured water temperatures along the lake's edges at 82–92°C, noting intense steam rising from the center that prevented closer access.^[16] They also attempted to gauge the depth by lowering a weighted line, estimating it exceeded 59 meters, though the boiling conditions and murky waters limited precision.^[18] These measurements, reported in contemporary scientific journals, provided the earliest quantitative insights into the lake's extreme hydrothermal conditions.^[17] The discovery and subsequent documentation quickly classified the Boiling Lake as a flooded fumarole—a vent in the Earth's crust filled with superheated water driven by magmatic gases—capturing the attention of geologists and volcanologists in the late 19th century.^[19] This interest underscored Dominica's broader geothermal and volcanic potential, positioning the site as a key example of active hydrothermal systems in the Lesser Antilles arc and inspiring early studies of regional seismic hazards.^[2]

Notable Events and Fluctuations

In 1880, a phreatic eruption in the Valley of Desolation near the Boiling Lake led to significant seismic activity that partially drained the lake, leaving it almost empty and transforming it temporarily into a steaming vent.^[20] The event, occurring on January 4, involved steam explosions and ash emissions, with the lake gradually refilling over subsequent months through hydrothermal inputs.^[19] A tragic incident unfolded in 1901 when the lake, already at a low level, experienced a small steam and gas explosion that released harmful volcanic gases, primarily carbon dioxide, asphyxiating and killing two individuals—a visitor and a local guide—who were positioned at the water's edge.^[1] This event highlighted the unpredictable hazards of the site's hydrothermal dynamics during periods of instability.^[21] The lake underwent a major fluctuation between December 2004 and April 2005, draining completely on multiple occasions due to stress from the Mw 6.3 Les Saintes earthquake on November 21, 2004, and subsequent aftershocks, which likely altered subsurface pathways and allowed water to escape.^[2] By late December 2004, the lake was reported as nearly empty with minimal bubbling and surface temperatures dropping to around 20°C, before refilling rapidly by April 2005 as geothermal activity resumed.^[19] On July 6, 2007, adventurer George Kourounis conducted the first documented traverse across the lake's surface, suspended by ropes over the boiling waters, during which measurements recorded edge temperatures reaching up to 197°F (92°C), underscoring the extreme thermal conditions at the center.^[22] In March 2024, the lake experienced a significant drop in water levels, with little to no water observed by 29 March, followed by a period of slow refilling. This event is consistent with the historical pattern of instability at the site.^[23] Since the early 2000s, the Boiling Lake has been subject to systematic monitoring by the University of the West Indies Seismic Research Centre (UWI-SRC), which tracks water levels, temperatures, and gas emissions, providing regular updates to Dominica's Office of Disaster Management to issue volcanic alerts during fluctuations.^[24] This ongoing surveillance has documented at least eight instances of significant water level changes since 1876, aiding in hazard assessment without predicting eruptions.^[1]

Access and Tourism

Hiking Trails

The primary access to the Boiling Lake is via a strenuous hiking trail originating from the village of Laudat in Dominica's Morne Trois Pitons National Park, covering a 13 km round-trip distance.^[25] The route begins near the entrance to Titou Gorge, proceeds through dense rainforest along a relatively flat initial path, then ascends the slopes of Morne Nicholls with significant elevation gain of approximately 900 meters.^[26]^[27] Hikers encounter river crossings, including warm streams suitable for brief swims, before traversing the barren, steaming terrain of the Valley of Desolation marked by sulfur deposits and active fumaroles.^[15]^[28] The full hike typically requires 6 to 8 hours, with 3 to 4 hours each way, depending on fitness levels and weather conditions; the return journey mirrors the outbound path but can feel more challenging due to fatigue and descending steep, often muddy sections.^[26] Rated as difficult, the trail features uneven rocky terrain, slippery inclines after rain, and exposure to high humidity and heat, demanding sturdy hiking boots, ample water, and physical preparation.^[29] Along the way, visitors pass hot springs for cooling dips, hissing sulfur vents, and boiling mud pools, culminating at a designated viewpoint about 50 meters from the lake's edge for safe observation of its bubbling surface.^[30]^[31] Since recent safety regulations following tourist incidents, hiring a licensed guide is mandatory for all hikers, arranged through the Dominica Forestry, Wildlife and Parks Division or authorized tour operators, with permits required at the trailhead.^[32] Guides, typically costing $50 USD per person for groups of four or more, provide navigation expertise, hazard awareness, and interpretive information on the hydrothermal features encountered.^[29]^[31] This requirement ensures safer passage across the volatile volcanic landscape while supporting local employment in the national park.^[33]

Cable Car Development

The Boiling Lake cable car project represents a major infrastructure initiative in Dominica, designed to provide aerial access to the site's viewpoints within Morne Trois Pitons National Park. This detachable gondola system, spanning 6.6 kilometers, is the world's longest of its kind and connects the Roseau Valley to elevated platforms overlooking the lake, completing the journey in approximately 20 minutes—a stark contrast to the traditional six-hour hike. Developed by the Austrian firm Doppelmayr Garaventa Group in collaboration with ABL Holdings, the project emphasizes sustainable transport through eco-friendly engineering in a UNESCO World Heritage area.^[34]^[35] Construction commenced in 2023, with the system featuring 10-passenger cabins equipped for panoramic views of rainforests, waterfalls, and geothermal features. The installation includes a bottom station with shopping and refreshment areas, an upper station boasting a restaurant, panoramic terrace, and viewing platforms, along with a short hiking trail to the lake from the terminus. Capable of transporting up to 1,000 passengers per hour in each direction, the cable car incorporates multiple intermediate supports for stability across the rugged terrain. Funding draws from Dominica's Citizenship by Investment Programme and international partnerships, supporting the eco-tourism focus.^[34]^[36]^[37] As of late 2025, the project nears completion, with operations slated to begin in December, potentially delayed to early 2026 pending final testing. This development aims to enhance accessibility for elderly and disabled visitors by eliminating physical barriers associated with the strenuous trail, while projecting to draw around 20,000 annual visitors and generate over 150 permanent jobs to stimulate the local economy. By tripling potential park attendance through inclusive access, the cable car positions Dominica as a leader in sustainable adventure tourism.^[38]^[39]^[35]^[40]

Safety and Conservation

Associated Hazards

The Boiling Lake poses severe thermal dangers primarily from its scalding waters and emanating steam, with surface temperatures typically ranging from 80 to 90°C and edge areas reaching up to 92°C, rendering any direct contact capable of causing third-degree burns or death.^[2] Attempts to traverse the central boiling zone, where temperatures exceed boiling point due to intense hydrothermal input, have historically proven lethal, as the superheated conditions prevent safe passage.^[2] Toxic gas emissions from the lake, including carbon dioxide (CO₂) and hydrogen sulfide (H₂S), present risks of asphyxiation and respiratory distress, particularly during periods of low water levels when gases accumulate more readily.^[41] These fumes can be carried by wind shifts into adjacent valleys, trapping visitors in hazardous concentrations; a notable example occurred in 1901, when a steam and gas explosion released lethal CO₂, killing two people near the drained lake.^[1]^[2] Geological instability introduces further threats, such as phreatic eruptions driven by overpressurized steam, which can propel ballistic debris up to 95 meters and generate blasts with velocities exceeding 130 m/s, potentially triggered by earthquakes or landslides from weathered crater walls.^[8] Lahars—hot mudflows from erupted material—could also form, endangering downstream areas, while seismic activity has been linked to sudden lake drainages that heighten eruption risks.^[8] The University of the West Indies Seismic Research Centre continuously monitors lake levels, gas flux, and regional seismicity to provide early warnings of such events.^[1] Path-specific hazards during approaches to the lake include slippery, mud-laden trails that become treacherous after sudden tropical downpours, increasing the likelihood of falls or slips on steep inclines and loose terrain.^[1] Rapid weather changes, common in the volcanic valley, can lead to poor visibility and flash flooding along river crossings, while encounters with local wildlife, such as venomous snakes, add to the risks for hikers navigating the rugged, forested routes.^[1]

Environmental Protection

The Boiling Lake is situated within Morne Trois Pitons National Park, designated as Dominica's first national park in 1975 under the National Parks and Protected Areas Act to safeguard its unique volcanic and forest ecosystems.^[4] In 1997, the park was inscribed as a UNESCO World Heritage Site under criteria (viii) for its ongoing geological processes and (x) for its exceptional biodiversity, which includes the largest expanse of pristine tropical forest in the Lesser Antilles and serves as a critical habitat for endemic species such as the Sisserou parrot (Amazona imperialis), a vulnerable bird found only on Dominica.^[4]^[42] This protected status underscores the area's ecological significance, where the lake's hydrothermal environment supports unique microbial communities, including sulphur-oxidizing bacteria that thrive in the high-temperature waters and contribute to geochemical processes like sulphur cycling.^[13] To preserve the fragile terrain and prevent environmental degradation, strict regulations govern access to the Boiling Lake and surrounding areas. Visitors are required to use certified guides for the trail from Titou Gorge, with visitor management measures in place to minimize trail erosion and contamination risks.^[29]^[42] Off-trail access is prohibited, and entry is controlled through official points with fees of US$5 per person for a one-day pass or US$12 for a week-long pass, valid across national park sites including the Boiling Lake trail—as of 2025—to fund conservation efforts, alongside enforced opening hours and bans on activities that could disturb the habitat.^[43]^[42] These measures, overseen by the Forestry, Wildlife and Parks Division, also include buffer zones around sensitive sites to curb agricultural encroachment and illegal hunting.^[42] Ongoing monitoring and research efforts focus on the park's geothermal dynamics and biodiversity, involving collaborations with local agencies like the University of the West Indies Seismic Research Centre for seismic and hydro-meteorological studies at the Boiling Lake, including a camera installation in 2016 to track water levels and venting.^[1]^[42] The site's hydrothermal features, including thermophilic microbes, inform broader geothermal energy potential assessments for Dominica, estimated at 1,390 MWe.^[44] A 10 MW geothermal power plant in the Roseau Valley, informed by studies of sites like the Boiling Lake, is under construction and expected to become operational by the end of 2025.^[45] Additionally, as of November 2025, the ongoing cable car project to improve access is scheduled to open in December 2025 and incorporates environmental impact assessments to mitigate construction effects on the rainforest, emphasizing minimal disturbance through careful site selection and materials.^[46]^[47]^[48]

References

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The Boiling Lake is a volcano-hydrothermal feature located in an area next to the Valley of Desolation in southern Dominica. The lake is roughly 60m in ...Missing: geology | Show results with:geology
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Morne Trois Pitons National Park - UNESCO World Heritage Centre
With its precipitous slopes and deeply incised valleys, 50 fumaroles, hot springs, three freshwater lakes, a 'boiling lake' and five volcanoes, located on the ...Maps · Gallery · Documents · Indicators
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Morne Nicholls, Dominica. 975 meters, 3199 feet. This is a Provisional Peak entered by a registered Peakbagger.com user. Peak submitted by ...
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Welcome to Dominica. Experience the thrill of exploring Dominica's rugged natural landscapes and discover hidden gems along the way.
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The simply-named Frying Pan Lake occupies 38,000 square meters in part of the volcanic crater. The shallow waters average a deadly 110-130 degrees Fahrenheit.Missing: size | Show results with:size
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Hydrothermal eruptions at unstable crater lakes - ScienceDirect.com
With a water volume of ~1.22 × 104 m3 when filled (Fournier et al., 2009), the Boiling Lake is the second largest high-temperature lake in the world (Di Napoli ...Missing: dimensions depth appearance<|control11|><|separator|>
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Boiling lake (the last eruption of which occurred in A.D. 1880). The dominant rock type in Dominica throughout Pleistocene and. Quaternary times is medium-K ...<|control11|><|separator|>
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The hike to Boiling Lake takes six hours as it climbs to Morne Nicholls and through the Valley of Desolation before reaching the lake.
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the boiling lake was allegedly “discovered” – that is, first visited by white europeans – in January 1875. its “discoverers,” edmund watt and henry nicholls, ...
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Notes - Nature
**Summary of Boiling Lake Content:**
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The Boiling Lake is a flooded fumarole, which is filled with bubbling ... Approximately 60 meters (197 feet) in width and length, and around 59 meters ...Missing: depth | Show results with:depth<|separator|>
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The Boiling Lake is a volcano-hydrothermal feature located in an area next to the Valley of Desolation in southern Dominica. The lake is roughly 60m in diameter ...Missing: flooded fumarole 19th century
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... volcanic activity. However, in 1901 a small steam and gas explosion from the Boiling Lake (which was almost empty at the time) released harmful gases ...Missing: 1900 wardens
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World's First Traverse of the Boiling Lake - Dominica, West Indies - July 6, 2007. Suspended by rope over the violently boiling sulfurous lake. Traverse_M05 ...
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Mar 4, 2024 · It spans approximately 8 miles (13 km) round trip and often takes 6 to 8 hours to complete. Start by acclimatizing to Dominica's tropical ...<|control11|><|separator|>
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Jul 8, 2025 · This is no place to fall. The first view of Boiling Lake (elevation 2,640 feet), a flooded fumarole, was anticlimactic.<|control11|><|separator|>
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Morne Nicholls and Boiling Lake (standard route) - Summit Post
Once down into the Valley of Desolation, the trail becomes even more interesting. There are many hot and cool springs, bubbling hot pools, and even some geysers ...
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Rating 4.7 (404) This challenging trail winds through the rugged terrain of Morne Trois Pitons National Park, taking you past lush rainforests, steep ascents, sulfur vents.
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Rating 4.9 (441) Said to be the second largest in the world, this hot springs lake is a caldron of gray-blue water at a temperature ranging from 180 to 197 degrees Fahrenheit.
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A new visitor experience is being created at Boiling Lake, which guests will in future be able to reach by the world's longest gondola lift.
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Gases such as sulphur dioxide (SO2), and hydrogen sulphide (H2S) ... People have died in this way at the Boiling Lake in the Valley of Desolation in Dominica.
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None
Summary of each segment:
[40]
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An increase in lake water temperature resulting in increased activity of sulphur oxidizing bacteria inhabiting the lake. Such bacteria are responsible for ...Missing: thermophilic microbes
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Impact type. Description. Cable Car Dominica: During Construction, the landscape may be affected by site- clearing activities, construction equipment and ...<|control11|><|separator|>