Glacier's and Earth's Past

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Across
  1. 2. the comparison of fossils in different rock layers
  2. 3. a flowing mass of ice
  3. 4. the gravitational force exerted on an object
  4. 6. a global climate marked by long periods of cold temperatures
  5. 9. the average weather in a location over 30 years
  6. 10. the conditions of the atmosphere at a specific place or time
  7. 11. the remains of ancient animals and plants
  8. 13. a narrow ridge that is left behind from glacial till
Down
  1. 1. the eroded sediment that is deposited as glaciers retreat
  2. 4. the circulation of water through the hydrosphere
  3. 5. the attractive force between all matter
  4. 7. when a species no longer has living members in existence
  5. 8. a cylinder of ice drilled out of glaciers that contains layers of snow
  6. 11. a long and narrow valley
  7. 12. a period of time characterized by a specific weather pattern