THE SOIL EROSION

Jelmarie Cerillo Velacruz

Ab English Language II

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

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.

MANIFESTATION OF HUMAN ACTSCAUSING SOIL EROSION

Deforestion

Overgazing

Over cropping

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.

ACTIVITIES OF MAN Contributing to soil Erosion and

disruption of earth surface

AGRICULTURAL DISTTURTION Logging Farming

Catle Ranching Hydroelectri desert

Urbanization

DISRUPTION OF LANDSCAPE Surface Mining Strip mining

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.

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