Other interpretations of this model of the Earth include the following additional spheres: Hydrosphere (Greek hydro means water) in physical geography, describes the collective mass of water found on, under, and over the surface of a planet. ... The biosphere is the part of a planets outer shell — including air, land, surface rocks and water — within which life occurs, and which biotic processes in turn alter or transform. ... The tectonic plates of the Lithosphere on Earth. ... Layers of Atmosphere (NOAA) Earths atmosphere is a layer of gases surrounding the planet Earth and retained by the Earths gravity. ...
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