Across
- 4. certain fossils known to exist in a particular time and place
- 6. the eroded sediment that is deposited as glaciers retreat and expand
- 8. the circulation of water through the hydrosphere
- 11. the average weather in a location over 30 years or more
- 12. when a species no longer has living members in existence
- 13. a global climate marked by long periods of cold temp
Down
- 1. a flowing mass of ice and snow that forms on mountain tops and near the north and south poles
- 2. the comparison of fossils in different rock layers to determine how old a rock or fossil is
- 3. all of the fossils that have ever been found
- 5. the conditions of the atmosphere at a place and time
- 7. the remains of ancient animals and plants
- 9. the transport of sediment by wind, water, or gravity
- 10. the breakdown of rocks into smaller pieces
- 13. cylinders of ice drilled out of glaciers