【文章內(nèi)容簡(jiǎn)介】 ouse button or press the Space Bar to display the answer. Western Climates (cont.) (pages 122–124) Section 215 Interior Climates Click the mouse button or press the Space Bar to display the information. ? Some prairie grasses grow up to 12 feet high ( m) as a result of rainfall ranging from 10 to 30 inches (26 to 76 cm) every year. ? Prairies Prairies, or naturally treeless expanses of grasses, spread across North America’s midsection. ? (pages 124–125) Section 216 Interior Climates (cont.) ? During the 1930s, several seasons of drought and dry winds blew the soil away, and the area was nicknamed the Dust Bowl. ? The Dust Bowl When farmers settled the Great Plains, they plowed up the sod formed by prairie grasses, leaving the soil without protection. ? Click the mouse button or press the Space Bar to display the information. (pages 124–125) Section 217 Click the Speaker button to listen to the audio again. (pages 122–124) Interior Climates (cont.) Section 218 What steps have farmers today taken to prevent future dustbowl disasters? Farmers have planted shelter belts of trees to moderate wind damage, rotated crops, allowed some areas to remain in grass, adopted notill farming practices, contour plowed to conserve moisture, and planted cover crops. Many participate in governmentsponsored conservation programs. Click the mouse button or press the Space Bar to display the answer. Interior Climates (cont.) (pages 124–125) Section 219 Eastern Climates Click the mouse button or press the Space Bar to display the information. ? Much of the original deciduous forest has been cleared for agriculture. ? ? Wetlands and swamps shelter a great variety of plants and animals. ? ? Every summer, the region prepares for hurricanes. ? The southeastern United States, with a humid subtropical climate, has mild winters and long, muggy summers. ? (page 125) Section 220 Click the mouse button or press the Space Bar to display the information. Eastern Climates (cont.) ? Much of this area is prone to winter blizzards–snowstorms with high winds, heavy or blowing snow, and little visibility. ? The northeastern United States and southeastern Canada have a humid continental climate with bands of deciduous and mixed forestland. ? (page 125) Section 221 Click the Speaker button to listen to the audio again. Eastern Climates (cont.) (page 125) Section 222 Click the mouse button or press the Space Bar to display the answer. In which region would you prefer to live? Why? Possible answers: The Northeast, because the climate changes during each of the four seasons, or the South, because the winters are mild. Eastern Climates (cont.) (page 125) Section 223 Click the mouse button or press the Space Bar to display the information. ? Southern Florida has a tropical savanna area, and both Hawaii and Puerto Rico have tropical rain forests. ? Hawaii, Puerto Rico, and the southern tip of Florida have tropical climates. ? Tropical Climates (page 125) Section 224 Tropical Climates (cont.) Click the mouse button or press the Space Bar to display the answer. Why is southern Florida the only place in the continental United States to have a tropical climate, and what kind of tropical climate exists there? Florida’s southern tip lies in the low latitudes. The rest of the continental United States is too far north to have tropical climates. Florida’s tropical savanna climate zone has seasonal rains, vast grasslands, and high temperatures yearround. (page 125) End of Section 2 ? Canada and the continental United States have similar landforms, shaped by similar geologic processes. ? Chapter Summary 1 Section 1: The Land (pages 115–120) ? Both have high, sharp mountains and dry plateaus in the west。 rolling, grassy plains in the center。 and lower, older mountains and coastal lowlands in the east. ? ? The region’s waterways, including rivers, lakes, coastal waters, and intracoastal channels, played a vital role in settling the land and continue to serve as mercial highways. Key Points Click the mouse button or press the Space Bar to display the information. ? The Continental Divide divides the region into two large drainage areas. ? Chapter Summary 2 Section 1: The Land (pages 115–120) ? To the east of the Divide, waters flow to the Arctic Ocean, to Hudson Bay, to the Atlantic Ocean, or to the Gulf of Mexico. To the west, they flow into the Pacific Ocean. ? ? Glacial movement shaped much of the North American landscape. ? ? The geologic factors that shaped the United States and Canada also provided the region with a wealth of natural resources. Key Points Click the mouse button or press the Space Bar to display the information. Chapter Summary 3 ? The region enpassing the United States and Canada experiences a great variety of climates. ? ? Some climate regions of the United States and Canada are influenced primarily by latitude. ? ? Wind, ocean currents, rainfall patterns, and elevation moderate the effects of latitude in other climate zones of the United States and Canada. Click the mouse button or press the Space Bar to display the information. Key Points Section 2: Climate and Vegetation (pages 121–125) Chapter Summary 4 ? Climatic factors cause hazardous seasonal weather patterns in the United States and Canada, including spring and summer tornadoes, and summer and fall hurricanes, and winter blizzards. ? ? The region’s natural vegetation reflects its climatic variety, but human interaction with the envir