kenzie earth 2 - Lecture 4 Chapter 3 Earths Modern...

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Lecture 4, Chapter 3: Earth’s Modern Atmosphere Layers of the Atmosphere 1. Thermosphere (50-300 miles) 2. Mesosphere (31-50 miles) 3. Stratosphere (11-31 miles) 4. Troposphere (0-11 miles) Each layer is separated by a “ pause ” (meaning to change ). 1. Thermosphere Traits: The therosphere layer of the atmosphere, from 50-300 miles. Its upper boundary is called the thermopause . Beyond that is the exosphere. Auroras occur in the thermosphere Temperatures rise sharply in the thermosphere, up to 2200 degrees F. This is because there is intense radiation that makes the nitrogen and oxygen vibrate a lot and the amount of vibration is what determines “temperature”. But it doesn’t feel hot. This is because, although the individual molecules are moving rapidly, there are hardly any molecules. So, the energy can’t transmit from one molecule to another. 2. Mesosphere Traits: Occurs from 30-50 miles above the earth’s surface.
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