Across
- 4. Some fossils are formed in layers of mud that harden into _____.
- 5. An _____ animal is no longer living anywhere on earth.
- 6. Some _____ fossils have actually been found in layers of rock.
- 8. _____ learn about ancient seas by studying fossils.
- 9. Most fossils are the _____ parts of animal like bones, shells, and teeth.
Down
- 1. Sometimes plant _____ can be preserved in fossils.
- 2. Some fossils are just _____ or wormholes.
- 3. Fossils provide _____ of plants and animals that lived long ago.
- 6. _____ are traces of organisms that lived long ago.
- 7. Some fossils show that _____ was once warm enough for plants to grow.
