Across
- 4. fossils formed from traces left by animals
- 5. the time it takes a planet to travel once around the Sun
- 7. the best soil for growing plants
- 8. rocks formed in fire
- 10. the spinning of a planet on its own axis
- 11. rocks that contain fossils
- 13. system the Sun and everything in space that travels around it
- 14. soil found next to lakes and rivers
Down
- 1. a planet's movement around the sun
- 2. rocks formed from particles
- 3. the surface of the Earth
- 6. rocks changed by heat and pressure
- 9. invisible path followed by a planet
- 12. fossils formed from the hard parts of plants and animals