1. The Biosphere The area of land, air, and water on or around the earth in which all living things can be found

2. Regions of the Biosphere l Hydrosphere - water l Lithosphere - land l atmosphere - air

3. Importance of the Earth’s Atmosphere 1.Holds gases that are vital for life l these gases include Oxygen, Nitrogen, Hydrogen, Water

4. Importance of the Earth’s Atmosphere 2.Blocks Radiation l Ozone found in a layer 16- 48km above the earth blocks U.V. rays that are emitted by the sun. l U.V. rays in high amounts may cause premature skin aging, cancer, sunburn, eye damage

5. Importance of the Earth’s Atmosphere 3.Climate Control l circulating air in the atmosphere distributes heat as well as moisture which will eventually fall as precipitation

6. Materials in the Biosphere must be Recycled l Materials such as carbon, oxygen, carbon dioxide, nitrogen and water are available in the biosphere in definite and fixed amounts and therefore must be recycled