Glaciers and Earth's Past

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