Across
- 2. a mixture of gases that we breathe and that is necessary for life
- 4. the layer of the earth's surface made of dirt
- 6. a hard substance that comes from the earth and does not contain plant or animal substances
- 8. a living thing that is not a plant and moves around to find food
- 9. the liquid in rivers, oceans and lakes
Down
- 1. a hard and often black material found in the earth; it can be burned to obtain energy
- 3. any substance or material that is burned to obtain energy
- 4. light that comes from the sun
- 5. living things that have leaves and roots and usually grow in the ground
- 7. the movement of air; air moving over the earth