Across
- 2. The remains or imprint of something preserved in rock
- 3. A mass of compressed ice and snow that expands and retreats, found near the North and South poles
- 5. A cylindrical piece of ice drilled out of a glacier that tells scientists about weather patterns in different time periods
- 6. A time period categorized by cold temperatures that have perfect conditions for forming glaciers
- 8. The process of the circulation of Earth's water
- 11. The average weather in a location over 30 years or more
- 12. All the fossils found that tell scientists about the history of the Earth
- 13. When a species dies off completely
- 14. Fossils that exist at certain times or in certain places that can help scientists determine the age of other fossils
Down
- 1. Using different rock layers to determine how old a rock is
- 3. The attractive force between all matter
- 4. The force exerted on an object by the gravity of a planet or moon
- 7. The conditions of the atmosphere in a certain place at a certain time
- 9. The sediment that is eroded and deposited by a glacier as it expands and retreats
- 10. Periods of time caused by the Earth's tilted rotation that have different weather patterns and day lengths