Life that lives off the Earth's energy main content.

Life that lives off the Earth's energy

Part of Hall of Planet Earth.

Hydrothermal Vents

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An unusual environment for life exists deep in the oceans.  Where hot springs emerge on the ocean floor, a microbial community flourishes, living off the hydrogen sulfide and other compounds carried by the venting fluids.  Some of these microbes represent the most ancient life known, and they form the base of a food chain for a group of organisms that never see the light of the Sun.  Life may have begun around these deep hydrothermal vents.  If similar environments exist elsewhere in the solar system, they too may support life.

Sulfide chimneys from the Juan de Fuca Ridge
At the Juan de Fuca Ridge and elsewhere along the global system of mid-ocean ridges, the heat from intrusions of magma, or molten rock, causes seawater to circulate through the cracks in the rocks.  Sulfide chimneys build up around vents where the hot water returns to the ocean.  The underwater hydrothermal systems influence chemical composition of the ocean, and the venting hot waters and structures that build up around the vents illustrate how certain ore deposits formed. 

The Juan de Fuca Ridge
Two kilometers under the Pacific Ocean, where the Pacific and Juan de Fuca plates meet, lies a strange landscape with clusters of