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