Earth is a planet that has changed over time. Can be classified into 4 main groups of elements are First, The ground and rocks or lithosphere (Lithosphere), which appear as various geography. Second, The ground water (Hydrosphere), such as swamps Lake River canals and Ocean. Next, Atmosphere is composed of gas and vapor. The appropriate class of living organisms is the Troposphere. Finally, Biosphere is an area with rocks, water, and atmosphere suitable ground conditions for the existence of living organisms, including humans, animals and plants.