Across
- 1. long-term shifts in temperature due to human activity
- 6. a layer that indicates one year
- 8. ice cores are used to help learn about it
- 9. a large mass of slowly-moving ice and snow
- 10. large cylinder of ice that shows layers of snow and ice
Down
- 2. different forms of the same element that have an equal number of protons but a different number of neutrons
- 3. material released from volcanic eruptions
- 4. overall weather conditions in an area
- 5. most ice cores are drilled here
- 7. gas that is released from burning fossil fuels