.. Answer the following questions in brief. 1 Why is soil considered an important resource? Give any three reasons. 2- Highlight any three causes of soil erosion, 3. Explain hydrological cycle with the help of a diagram. 4 How does river water get polluted? Explain. 5. Identify any three ecological problems caused by building large dams.
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1 ans: because it provides food through agriculture.
2 overgrazing
Deforestation
Building Dams.
4 Chemical waste from factories is sometimes dumped into rivers and lakes, or directly into the ground. Pesticides (chemicals that kill insects) applied to farmland enter surface water and groundwater, often in large quantities. ... Some pollutants slowly break down into harmless chemicals.
5 The three ecological problems caused by building large dams could be soil erosion, extinction of species, loss of forests and wildlife, etc
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