front 1 minerals | back 1 solid materials, usually dug from the earth, such as coal or gold |
front 2 layers | back 2 thin or thick parts of something that are over or under one another |
front 3 magma | back 3 hot, melted rock under the surface of the earth |
front 4 fossils | back 4 parts or prints of a plant or animal that lived a long time ago |
front 5 soil | back 5 the loose top layer of the earth: dirt |