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Earthworm perform Leaching process in the soil..thats why they are also known as Best friends of farmers ..

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Earthworms play an important role in breaking down dead organic matter in the process of decomposition.They also mix the layers of soil inorder to make them more fertile.Vermicomposting is a type of composting in which earthworms are added to the soil in order to make them more fertile.They excrete is also used as a manure.