The Earth's Spheres
Atmosphere, Lithosphere, Hydrosphere
Scientists divide our home planet into three spheres. Each sphere is categorized according to its physical characteristics. These spheres are the Atmosphere, which is made of all the Earth's gases; the Lithosphere, which is made up of all the Earth's physical materials, such as rocks and soil; and the Hydrosphere, which is made up of all the Earth's water.
Using this interactive tool, you can mouse over each sphere and learn more about it.