Across
- 1. state where CO2 levels are measured
- 5. gives off heat
- 7. gas given off by burning fossil fuels
- 10. a thin layer of gases the surrounds the earth
- 14. the biggest under water current
- 15. frozen parts of the oceans
Down
- 2. sheets of ice covering land
- 3. protective layer of gases
- 4. a big block of ice
- 6. the warming of the earths overall temp
- 8. season where the CO2 is the lowest
- 9. a long period of the earth being frozen
- 11. season where the CO2 is the highest
- 12. how much the overall temp has changed
- 13. how high the sea water is