Columns Observations A B с Questions: 1. Based on your observation, which pan had the least amount of soil destroyed? How about the greatest? 2. Based on your observation, explain how the slope of the land affect the rate of erosion? 3. Based on your observation, how the does the slope of the land affect erosion in your community? 4. Based on your observation, what effects of erosion in your community can you infer?
Answers & Comments
Answer:
1. soil crep
2. as the slope increases, the type of erosion changes, chiselling the ground into different shapes and thereby increasing the surface area - and hence the number of pores that can absorb water, at least in the initial phase.
3. as the runoff flowed along the slope, it began to erode the soil and carry sediments; thus, the runoff required more energy to transport sediments on the slope. The energy required to erode the soil decreased to the minimum value at the 40 m gentle-slope land site.
4. soil degradation leads directly to water pollution by sediments and attached agricultural chemicals from eroded fields. Soil degradation indirectly causes water pollution by increasing the erosive power of runoff and by reducing the soil's ability to hold or immobilize nutrients and pesticides.