list any three causes of soil
Answers
Explanation:
- deforestation.
- overgrazing.
Soil compaction, low organic matter, loss of soil structure, poor internal drainage, salinisation and soil acidity problems are other serious soil degradation conditions that can accelerate the soil erosion process. This Factsheet looks at the causes and effects of water, wind and tillage erosion on agricultural land.
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Answer:
1. Water runoff and rainfall intensity
This process begins when the raindrops break down the soil making it vulnerable to movement. The lighter soil aggregates like silt, fine sand, clay, and organic matter are then easily carried away by the moving water. A higher magnitude runoff could lead to erosion of the gravel particles and the other large sand. Splash erosion, though mostly considered as insignificant is also caused by raindrops. The intensity of this erosion is only felt when it occurs in large exposed fields.
2. The slope of the land
The topography of the land may also be a cause of soil erosion. Steeper areas experience a higher intensity of runoff due to the increased speed. Even heavier particles can easily be carried away by the moving water. This reason why hilly areas do face a more violent erosion compared to flat land.
3. Soil texture
The fineness and the structure of soil particles may also prompt the occurrence of erosion. The fine and loose soil structures can be easily carried away more than large and firm soil. The fine soil is more susceptible to the agents of soil erosion hence can easily be moved.