Composting is the process of converting organic materials like plant material, food waste, and manure into humus. humus is a soil-like material. there are many benefits that composting has for the environment. how does composting protect our ground water supply?
a) it prevents run off from occurring.

b) it reduces the need for artificial fertilizers.

c) it reduces the amount of methane that is produced.

d) it increases filtration of the soil and reduces compacting.

your answer was wrong the correct answer to this question is b

B) It reduces the need for artificial fertilizers.  

Composting is the process of conversion of organic materials like plant material, food waste, and manure into humus. The humus increases the soil fertility by providing organic matter necessary for plant growth. It reduces the need for artificial fertilizers which can contaminate the groundwater. Hence, compositing protect our ground water supply.

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correct answer is a. and d.