1. The summer wind, came rolling in, from across the bay

2.  Uneven heating of the Earth’s surface causes some areas to be warmer than others  Warmer air is less dense and moves.

3.  The rotation of the Earth causes wind.  Like a spinning ball

4. Polar Easterlies: In the polar regions, cold, dense air sinks and moves away from the poles. Westerlies Near 30 degrees. Earth’s rotation moves winds from west to east toward polar region Trade Winds: Air near the equator heats up and move to the poles Equatorial Doldrums: Air heats up and becomes less dense, causing low pressure and almost daily rain storms.

5.  Narrow belts of strong air near the top of the Troposphere  Jets flying East ride the wind to save time and fuel  Jets flying west fly at different altitudes (heights) to avoid the headwind.

6.  During the day, the sun heats the land and causes it to rise.  When the warmer, less dense air move up, cooler air from the sea moves in, causing a wind

7.  At night land cools.  The warmer air over the sea rises and the land air moves in, causing a wind.