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End Show Slide 1 of 26 Copyright Pearson Prentice Hall 4-1 The Role of Climate

End Show 4-1 The Role of Climate Slide 2 of 26 Copyright Pearson Prentice Hall What Is Climate? Weather is the day-to-day condition of Earth's atmosphere at a particular time and place. Climate refers to the average year-after-year conditions of temperature and precipitation in a particular region.

End Show 4-1 The Role of Climate Slide 3 of 26 Copyright Pearson Prentice Hall What Is Climate? Climate is caused by: trapping of heat by the atmosphere latitude transport of heat by winds and ocean currents amount of precipitation shape and elevation of landmasses

End Show 4-1 The Role of Climate Slide 4 of 26 Copyright Pearson Prentice Hall The Greenhouse Effect How does the greenhouse effect maintain the biosphere's temperature range?

End Show 4-1 The Role of Climate Slide 5 of 26 Copyright Pearson Prentice Hall The Greenhouse Effect Atmospheric gases that trap the heat energy of sunlight and maintain Earth's temperature range include: carbon dioxide methane water vapor

End Show 4-1 The Role of Climate Slide 6 of 26 Copyright Pearson Prentice Hall The Greenhouse Effect The natural situation in which heat is retained in Earth’s atmosphere by this layer of gases is called the greenhouse effect. Sunlight Earth’s Surface Atmosphere Some heat escapes into space Greenhouse gases trap some heat

End Show 4-1 The Role of Climate Slide 7 of 26 Copyright Pearson Prentice Hall The Effect of Latitude on Climate Solar radiation strikes different parts of Earth’s surface at an angle that varies throughout the year. At the equator, energy from the sun strikes Earth almost directly. At the North and South Poles, the sun’s rays strike Earth’s surface at a lower angle.

End Show 4-1 The Role of Climate Slide 8 of 26 Copyright Pearson Prentice Hall The Effect of Latitude on Climate What are Earth's three main climate zones?

End Show 4-1 The Role of Climate Slide 9 of 26 Copyright Pearson Prentice Hall The Effect of Latitude on Climate As a result of differences in latitude and thus the angle of heating, Earth has three main climate zones: polar, temperate, and tropical

End Show 4-1 The Role of Climate Slide 10 of 26 Copyright Pearson Prentice Hall The Effect of Latitude on Climate Earth’s Main Climate Zones Sunlight Most direct sunlight 90°N North Pole Temperate Tropical Temperate Polar Arctic Circle Tropic of Cancer Equator Tropic of Capricorn Antarctic Circle 90°S South Pole 66.5°S 23.5°S 23.5°N 66.5°N Polar Sunlight 0°

End Show 4-1 The Role of Climate Slide 11 of 26 Copyright Pearson Prentice Hall The Effect of Latitude on Climate The polar zones are cold areas where the sun's rays strike Earth at a very low angle. Polar zones are located in the areas around the North and South poles, between 66.5° and 90° North and South latitudes.

End Show 4-1 The Role of Climate Slide 12 of 26 Copyright Pearson Prentice Hall The Effect of Latitude on Climate The temperate zones sit between the polar zones and the tropics. Temperate zones are more affected by the changing angle of the sun over the course of a year. As a result, the climate in these zones ranges from hot to cold, depending on the season.

End Show 4-1 The Role of Climate Slide 13 of 26 Copyright Pearson Prentice Hall The Effect of Latitude on Climate The tropical zone, or tropics, is near the equator, between 23.5° North and 23.5° South latitudes. The tropics receive direct or nearly direct sunlight year-round, making the climate almost always warm.