What is wind? The _________ heats the Earth ______________, so there are many areas of _________ pressure and __________ pressure. Air moves from _________ pressure to _________ pressure forming winds. The ___________ the difference between the high and low pressure areas, the ____________ the wind speed is. Wind is ________________ _______! Why does air move?? Wind _________ because of differences in _________ pressure. The greater the pressure difference, the faster the wind moves. Why does the air pressure change? Because of the _____________ ____________ of the Earth. The air at the equator is ____________, and _______ dense so…it rises! This creates an area of low pressure. Remember Convection!! What are convection cells? The _____________ __________ caused by the rising and sinking of cold air. Surface winds blow from polar high pressure areas to equatorial low pressure areas. TRY THIS! At the ____________ the air is cold; at the ___________ the air is warm. What is the Coriolis Effect? The _____________ of moving objects, such as ________, by the Earth’s rotation is called the Coriolis Effect. Winds in the Northern hemisphere curve to the __________. Winds in the Southern Hemisphere curve to the _________.