Internal soil worms: They live and move directly under the soil surface, and dig horizontal tunnels. They primarily contribute to soil aeration and facilitate the access of water and oxygen to the roots. The earthworm helps in the production of humus, which improves the soil and stores the nutritious organic matter that helps plants grow. It helps create a good soil structure, as it opens up soil burrows and creates channels for good aeration and drainage. Worm gases or excrement are rich in nitrogen, phosphorus, and potassium; key minerals that help plant growth. For sale: 30 worms for 50 riyals. Limited quantity. Riyadh, Al-Sahafa. Contact via WhatsApp.