Tall grasslands are necessary for several reasons. First off, the grassland prairies of the mid-west, northern tundra and African Savannah are all necessary to sustain large herbivore herds. Grazers keep and grass levels in check through migration and constant eating of the grass. Another more crucial reason for large grass plains is the extensive root systems of grasses help keep the top soil anchored to the ground during strong winds. This was the main cause of the 1930’s Dust Bowl. Farmers removed the grasses that protected the top soil which led to erosion of the top soil and a wasting of the fertile lands.
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