Science Encyclopedias: The Weather Encyclopedia

Science Encyclopedias: The Weather Encyclopedia — page 9
atmosphere exosphere thermosphere mesosphere stratosphere troposphere Weather Is in the Atmosphere The air around Earth is called the atmosphere It is densest near the ground It becomes thinner at high altitudes From the ground upward the atmosphere has five layers the troposphere stratosphere mesosphere thermosphere and exosphere There is no clear boundary between the atmosphere and outer space One common dividing point is an altitude of 62 miles 100 km Above this there are still air molecules But the air is too thin for an airplane’s wings to generate lift The troposphere includes the air that makes life possible on Earth It is also where weather happens Weather phenomena happen in the lowest levels of the atmosphere 10