-Their burrows provide natural drainage and aeration channels
-They increase the depth of topsoil by burrowing into subsoil and bringing it to the surface in form of casts. Worms’ casts consist of refined soil in which plant materials have been broken down to humus
-Top soils produced by worms are neutral; they have the general effect of reducing both materials into their burrows, thus favoring plants
-The constant passage of soil through the gut reduces the particle to a fine state of division thus improving the soil texture
-The urine and faeces of earthworm increases soil fertility