KT Event (Cretaceous-tertiary)
~ Massive meteor hits coast of Mexico and causes extinction
Massive worldwide cooling
Tertiary Period (Cenozoic Era)
~ Climate became cooler and drier, mammals moved from asia to north america via
the Bering land bridge, radiation in flowering plants, mammals, ...
All weather occurs in this layer, we cannot survive about 8km
, Temperature at the top of this layer is -60C
Exosphere
✓✓✓✓~ The outer layer of the thermosphere, extending outward into space.
Thermosphere
✓✓✓✓~ The uppermost layer of the atmosphere, in which temperature increases as altitude
increases
Mesosphere
✓✓✓✓~ The strong, lower part of the mantle between the asthenosphere and the outer core
Stratosphere
✓✓✓✓~ 12 to 50 km, Ozone held here, absorbs UV radiation
Troposphere
✓✓✓✓~ 0-17 km above Earth's surface, site of weather, organisms, contains most
atmospheric water vapor. (temperature decreases with increasing altitude, pressure
decreases)
Ozone layer
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