Ice Age

123456789101112
Across
  1. 4. a flowing mass of ice and snow that forms on mountaintops and near the north and south poles
  2. 5. dating-the comparison of fossils in different rock layers to determine how old a rock or fossil is
  3. 7. the conditions of the atmosphere (temperature, humidity, wind speed, and precipitation)
  4. 8. fossil-certain fossils known to exist in a particular time and place that may be used to determine the age of rocks or other fossil
  5. 10. age- a global climate marked by long periods of cold temperature that cause glacial formation and expansion
  6. 12. when a species no longer has living members in existence
Down
  1. 1. record- all of the fossil that have ever been found, which scientists use to understand earth's history
  2. 2. cycle- the circulation of water through the hydrosphere from earth's surface to the atmosphere and back
  3. 3. the average weather in a location over 30 year or more
  4. 6. the transport of sediment by wind, water, or gravity
  5. 7. breakdown of rock into smaller pieces from exposure to wind, water, gravity, change in temperature, and/or biological forces
  6. 8. core- cylinder of ice drilled out of glaciers that contain layers of snow, dust, volcanic ash, atmosphere gases, and microbes from past time periods
  7. 9. till-the eroded sediment that is deposited as glacial retreat and expand
  8. 11. the remains of ancient animals and plants, the traces or impressions of living thing from past geologic ages, or the traces of their activities