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Chapter Outline Unit C, “Processes That Change the Earth” Chapter 3, “Weather and Climate” Lesson 2, “What Causes Wind?”, pgs. C72-C75 Uneven Heating Much of the sun’s energy is _____absorbed__________ by the Earth’s surface. _______Land________ heats up faster and cools off quicker than ____water___________. Local Winds The Earth’s surface is heated ______unevenly_________. Which is heavier, cold or warm air? Cold air The upward movement of warm air in the atmosphere produces _____updrafts__________. Air moves from high pressure areas to areas of lower pressure. This horizontal movement of air is called _______wind________. Define Local Winds – winds that depend on local changes in temperature Prevailing Winds Define Prevailing Winds – global winds that blow constantly from the same direction What causes prevailing winds? Uneven heating of large parts of Earth’s atmosphere and Earth’s rotation Winds that blow toward the poles curve ______east_________. Winds that blow toward the equator curve _____west__________. In most of the United States, prevailing winds curve to the east, producing west winds, called… Westerlies Westerlies cause most weather systems in the U.S. to move how? From west to east