how forests acts as water purifier
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Answer:
A forest is a purifier of air and water. Trees present in forests act as green filters. They release oxygen as a product of photosynthesis. In this way, they purify air by increasing the amount of oxygen in atmosphere. They also helps in removing harmful particles and pollutants.
Due to activity rain, soil gets erode. The eroded soil enters into water bodies and pollutes it. Trees slow down the activity of rain and rain water gets absorbed by the soil. In this way, forest help in purifying water.
While forests are less able to control some contaminants (the human parasite Giardia lamblia, for example), in most cases the presence of forests can substantially reduce the need for treatment for drinking-water and thus radically reduce costs of supplying water.