Hinweis der Redaktion
- Humus is the decayed material in soil.
- A nonliving substance in a form of a crystal which is taking from the earth.
- A scientist who studies the earth.
- A substance with smooth, flat surfaces that meet in sharp edges and corners.
- A rare, valuable mineral.
- The upper layer of soil.
- The layer of rock below the subsoil; part of the earth’s crust.
- A solid layer of rock beneath the soil.
- Hot, liquid tock within the earth.
- The innermost part of the earth
- The layer of the earth beneath the crust.