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Contributors in Ecology
Ecology
Geothermal energy
Biology; Ecology
Heat energy from the Earth's interior. Geysers and volcanos are naturally occuring examples.
Glacial trough
Biology; Ecology
A deep U-shaped valley formed by glacial erosion. Many contain cirques on the valley floor.
Periphyton
Biology; Ecology
Tiny organisms like algae and diatoms that cling to the underwater roots of aquatic plants.