Dirt

Dirt is made of rocks, sand, humus, and clay. Worms (and other little critters such as fungi, sow bugs, and springtails) eat the organic material (that means dead pieces of plants and animals) and some of the minerals in the soil and digest them (compost them) to make the nutrients available for plants. Fungi trade minerals and vitamins that plants can't easily get for sugars that the fungi can't easily get.

Joby and the 2013 leopard class