Across
- 3. Forms as a result of a mold.
- 4. It means turning into a stone.
- 7. This means recent life.
- 10. This means ancient life
Down
- 1. Eon that began about 540 million years ago.
- 2. Show the activities of the organism.
- 5. Largest section in geologic timeline.
- 6. Layers of rock.
- 8. This means middle life.
- 9. These are made from the hard parts of plants and animal.