Across
- 6. This kind of rock is formed when layers of material pile on top of each other
- 7. A piece of rock different in size or type than others in the area
- 8. This layer of sedimentary rock is the oldest
- 9. The origin of the glacier that once covered northern Indiana
- 10. Common Indiana rock formed from the shells of marine animals
- 11. Piles of rock pushed to together by glaciers to form hills
- 12. 500 million years ago North America was much farther _______ than today
Down
- 1. This era began two and a half million years ago and ended 11,700 years ago
- 2. The name of the last glacier to cover Indiana
- 3. 500 million years ago Indiana was covered by this
- 4. A depression or hole formed by retreating glaciers or floodwater
- 5. This substance results from the breakdown of marine animal shells