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Answer 1

Answer:

16.The Great Plains, located in North America, have an area of approximately 1,125,000 square miles (2,900,000 square km), roughly equivalent to one-third of the United States. Their length from north to south is some 3,000 miles (4,800 km) and their width from east to west is 300 to 700 miles.

17.Prairies are ecosystems considered part of the temperate grasslands, savannas, and shrublands biome by ecologists, based on similar temperate climates, moderate rainfall, and a composition of grasses, herbs, and shrubs, rather than trees, as the dominant vegetation type.

Answer 2

17. Prairies are ecosystems considered part of the temperate grasslands, savannas, and shrublands biome by ecologists, based on similar temperate climates, moderate rainfall, and a composition of grasses, herbs, and shrubs, rather than trees, as the dominant vegetation type. 

19. Basins are formed by forces above the ground (like erosion) or below the ground (like earthquakes). They can be created over thousands of years or almost overnight. The major types of basins are river drainage basins, structural basins, and ocean basins.