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15 questions
Soil erosion means
The removal of the bottom soil cover by water, wind and human activities
The removal of the top soil cover by water, wind and human activities
The removal of the middle soil cover by water, wind and human activities
_______________ leads to Sheet erosion on hilly slopes.
Afforestation
Deforestation
How are Gullies formed?
Presence of vegetation leads to formation of rills and then during heavy rains Gullies are formed.
Absence of vegetation leads to formation of rills and then during heavy rains Gullies are formed.
Removal of vegetation for land use like railways, roads, buildings and agriculture has caused
Rill erosion
Sheet erosion
Gully erosion
All of the above
Wind moves soil particles that are:
0.1-0.6mm
0.1-0.5mm
0.1-0.7mm
saltation means
0.1-0.7mm– size soil particles bouncing or hopping fashion due to wind
0.1-0.6mm– size soil particles bouncing or hopping fashion due to wind
0.1-0.5mm– size soil particles bouncing or hopping fashion due to wind
Soil creep is
greater than 0.5mm– size soil particles moving in rolling fashion due to wind
greater than 0.6mm– size soil particles moving in rolling fashion due to wind
greater than 0.7mm– size soil particles moving in rolling fashion due to wind
Wind erosion occurs in areas that have sandy or coarse bare soils(without any vegetation).
True
False
Occurs on gentle slopes, and is slow removal of thin layer of Soil.
Stream erosion
Sea erosion
Sheet erosion
Continuation of sheet erosion for long finger shaped rills or grooves are formed is called
Gully erosion
Rill erosion
Sea erosion
During heavy downpour deep gullies are made on bare soils due to water run off in
Gully erosion
Sheet erosion
Rill erosions
Changing courses as well as speed of streams and rivers cause erosion of soil around the bank.
Gully erosion
stream bank erosion
sea erosion
Erosion due to powerful waves and removal of broken material due to retreating waves.
Sea erosion
Stream bank erosion
Rill erosion
Causes of Soil erosion in India are
Population
Nature of Rainfall
Bad Farming Techniques
All of the above
Measures to prevent soil erosion are
Terrace Farming
Strip cropping
both 1 and 2
None of the above
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