soil erosion
answer =natural, geophysical, geological.
when the upper fertile layer of soil is lost, it becomes barren .The trees are uprooted .The fertility of the area is lost The land becomes unsuitable for cultivation or farming .Due to wind ,flowing water or grazing animals the naturally occurring soil erosion becomes hazardous for the environment.
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the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.
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SOIL
The soil is the top layer of the earth’s surface. It is made up of dirt and rock. It is filled with air and life. A variety of organisms, like insects, earthworm, live in soil. For plants, soil serves as a storehouse of water and minerals needed for their growth. It also provides shelter to many animals that live on or in the soil. Without soil, there would be no grass, no crops, no trees, no food for us and other animals.
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