Explains in detail about the reason for soil erosion and the methods involved in conserving the soil.

3. Plants grow using nutrients in the
soil and grow and make food.
Animals live in the soil.
Products from soil is used to
build homes.
Importance of Soil

4. By breaking down of rocks into
small pieces- WEATHERING
It is caused by animals, plants
rain, flowing water, wind and
weather changes.
How is soil formed?

5. Moving water
carries rocks
break into
smaller pebbles.
How is soil formed?

6. 
SOIL EROSION

7. Fast flowing rivers in hilly areas cause
SOIL EROSION.
Rivers carry more and more soil as they
flow down.
Erosion by water

8. 
 xcc
Erosion by wind
 Strong winds cause top soil to
be blown away.
 Soil settles down when the wind
speed is slow.
 Greatest in dry regions- Desert

9. 
Roots of plants hold soil particles
– reduce erosion.
Erosion by Human activities

11. Humans have cleared
forests to build
farms, cities,
factories and roads.
Bare land can cause soil erosion.
Ploughing leaves the soil loose.

12. Cattle exposes soil by
removing the plant cover.

13. After a crop is harvested and
before the next crop is sown,
the soil

17. Planting more trees and
plants can reduce soil erosion.

18. Growing hedges or trees along
the edges of farmland as
WINDBREAKERS.

19. Along the slopes of hills,
farming is done by cutting
steps in the slopes.

20. Strong embankments of rocks
and soil (BUNDS)built along
the banks.