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| Description: (a) Deep-sea vents are cracks in the Earth's surface that release hot gases, such as hydrogen sulphide (H2S). This heats the water near the vent and creates a gradient between the very hot water adjacent to the vent and the cold water that is farther away from the vent. The synthesis of organic molecules can occur in this gradient. (b) Photograph of a biological community near a deep-sea vent consisting of giant tubeworms, clams, and crabs.
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