powerpoint presentation of jelmarie
DESCRIPTION
soil erosionTRANSCRIPT
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THE SOIL EROSION
Jelmarie Cerillo Velacruz
Ab English Language II
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WHAT IS SOIL EROSION? Loss and
displacement of earths fertile topsoil
Soil is naturally removed by the action of water or wind: such 'background' (or 'geological') soil erosion has been occurring for some 450 million years
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PHISICAL CAUSES OF EROSION
wind By waterfallBoth rainfall and runoff factors must be considered in assessing a water erosion problem. The impact of raindrops on the soil surface can break down soil aggregates and disperse the aggregate material.
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MANIFESTATION OF HUMAN ACTSCAUSING SOIL EROSION
Deforestion
Overgazing
Over cropping
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PRINCIPAL EFFECT OF SOIL EROSION Deterioration of agricultural lands. Increase of flood occurence. Reduce Water supply Sintatics of reservoirs canals and rivers. Destruction of blags roads, and public
works. Depletion of wild life and other natural
resources.
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ACTIVITIES OF MAN Contributing to soil Erosion and
disruption of earth surface
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AGRICULTURAL DISTTURTION Logging Farming
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Catle Ranching Hydroelectri desert
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Urbanization
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DISRUPTION OF LANDSCAPE Surface Mining Strip mining
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CONCLUSION Because of continued advances in soil
management and crop production technology that have maintained or increased yields in spite of soil erosion, others have not been aware of the increasing problem on farmland. Awareness usually occurs only when property is damaged and productive areas of soil are lost.
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ADDITIONAL KNOWLEDGE The implications of soil erosion extend
beyond the removal of valuable topsoil. Crop emergence, growth and yield are directly affected through the loss of natural nutrients and applied fertilizers with the soil.
Soil quality, structure, stability and texture can be affected by the loss of soil