Why are earthworm called the friends of the farmers ?

Explanation

i.Earthworms loosen the soil by burrowing deep into it, thus they help to aerate the soil.
ii.This continuous digging of soil also helps the water to reach the roots quickly.
iii.Earthworms can decompose the organic matter from the soil and convert it into rich manure.
iv.This helps in increasing the fertility of soil, which ultimately increases the crop production. Thus, earthworm is called as friend of farmers.