Presentation on theme: "The Atmosphere THE ATMOSPHERE. Definition: Atmosphere Air that surrounds the earth Composed of: – Nitrogen 78% – Oxygen 21% – Misc. Gases (water vapor,"— Presentation transcript:
Definition: Atmosphere Air that surrounds the earth Composed of: – Nitrogen 78% – Oxygen 21% – Misc. Gases (water vapor, argon, etc… 1%)
How did it form? THEORY ………. As earth cooled, released gases from the earth’s interior Not the same composition as today’s atmosphere
Benefits of Atmosphere Provides gases necessary for life (oxygen, carbon dioxide) Protects us from majority of suns harmful UV radiation Allows light to reach surface for energy and photosynthesis Radiates some heat back to Earth, therefore warming the planet
12 – 50 km Lower part’s temperature is constant (~60 o C) Contains ozone layer People can’t breathe in this layer Lowest part of stratosphere there is less turbulence so where commercial airlines usually fly!
Mesosphere 50 – 80 km Temperature decrease to -100 o C Coldest region of atmosphere – This is due to the gases in this layer can’t absorb any of the suns energy (therefore, really cold) Protects earth from ‘meteorites’ Meteorites burn up in this area creating “shooting stars” effect