Across
- 3. in polar regions like Antarctica and Greenland, ice has been accumulating for hundreds of years. Scientists use this to provide a detailed record of climate change hundreds of years ago.
- 5. a large wave caused by the movement of the earth's crust.
- 7. remains of plants and animals
- 8. a practice of overuse of synthetic fertilizer and livestock farming.
- 9. the study of materials that make up the earth.
Down
- 1. each year, a tree adds a new layer of growth. Scientists use tree rings to learn about past climates.
- 2. the largest division of time.
- 4. liquid rock that is underground.
- 5. the use of automobiles and other forms of transportation rely on fossil fuel.
- 6. tearing down of trees.