As it tunnels deep into the ground ​ — as far down as 12 feet [4 m] — ​ the earthworm aerates the soil, brings various minerals toward the surface, and provides better drainage for water.
Uuristades käike kuni nelja meetri sügavusse mulda, õhustab vihmauss seda, toob ülespoole mitmesuguseid mineraale ja parandab mulla veeläbilaskvust.