Biosphere

Science / Biology / Biosphere: All ecosystems on Earth as well as the Earths crust, waters, and atmosphere on and in which organisms exist; also, the sum of all living matter on Earth.

Geosphere

Science / Weather / Geosphere: Considered the solid portions of the earth, including the hydrosphere and the lithosphere, as opposed to the atmosphere, which lies above it. At their conjunction is the biosphere. MORE

Gaia

Science / Biology / Gaia: A hypothetical superorganism composed of the Earths four spheres: the biosphere, hydrosphere, lithosphere, and atmosphere. MORE

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