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Download Erosion – The movement of soil by wind or water to some new location
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Transcript
Erosion – The movement of soil by wind or water to some new location. (naturally a slow process but speeds up quickly when it is exposed) - billions of tons of exposed topsoil are lost each year to erosion History - the invention of the plow greatly increased the amount of erosion by exposing large areas of farmland - early colonists would grow one crop (monoculture) in the same place every year until the nutrients were used up and then they would move on leaving exposed soil behind. - colonists moved west to the great plains where the soil was rich in organic matter. - Farmland increased rapidly and by the 1930’s giant dust clouds of soil blew across the county due to dry exposed soil. (dust bowl) - The government created the Soil conservation Service (SCS) (now the NRCS) within the Dept. of Agriculture to conserve the nation’s soils. - The NRCS maps and surveys soil to plan methods of soil conservation. - Modern technology has allowed the U.S. to increase its production allowing it to produce more food than needed. - In the 70’s the U.S. started growing grains for other countries adding to the erosion problem (dust storms in CA.) - Many conservation practices are still ignored when using large machinery because many practices are more difficult to do on a large scale. - Besides farming, highway construction, building construction, overgrazing and some logging activities all increase the rate of erosion Erosion – The movement of soil by _________ or _________ to some new location. (naturally a slow process but speeds up quickly when it is exposed) - billions of tons of exposed topsoil are lost each year to erosion History - the invention of the _________ greatly increased the amount of erosion by exposing large areas of farmland - early colonists would grow one crop (____________) in the same place every year until the ___________ were used up and then they would move on leaving exposed soil behind. - colonists moved west to the great plains where the soil was rich in ____________. - Farmland increased rapidly and by the 1930’s giant dust clouds of soil blew across the county due to dry exposed soil. (__________) - The government created the ____________________ (now the ________) within the Dept. of Agriculture to conserve the nation’s soils. - The NRCS maps and surveys soil to plan methods of soil conservation. - Modern technology has allowed the U.S. to increase its production allowing it to produce more food than needed. - In the_______ the U.S. started growing grains for other countries adding to the erosion problem (dust storms in CA.) - Many conservation practices are still ignored when using large machinery because many practices are more difficult to do on a large scale. - Besides farming, ________________, ____________, ___________and some _________________ all increase the rate of erosion