1. Spheres of Earth

2. Sphere of Earth: A layer that surrounds the Earth

3. The Four Spheres
Atmosphere: Shell of gases that surrounds a planet, for example, Earth
Earth’s atmosphere is unique because it contains oxygen
Atmosphere = Air
Lithosphere(also known as Geosphere): Solid portion of Earth below the atmosphere and the hydrosphere
Includes: rocks, mountains and beaches

4. Hydrosphere: Earth’s liquid water
Includes: oceans, lakes, streams and groundwater
Biosphere: The portion of Earth that supports life, from far down in the ocean to high up in the sky
a. Plants and animals are part of the biosphere

5. Interactions
Earth is the only known planet currently supporting life due to the interactions among its four spheres.
The four spheres of the Earth system are constantly moving and changing