Across
- 2. 78% of the atmosphere composition
- 3. glaciers expanding
- 5. used to measure the past atmosphere of the earth
- 6. glaciers shrinking
- 9. absorbs a d scatters ultra violet radiation
- 11. underwater current of warm and cold salt water
- 12. 0.93% of the atmosphere
- 14. took place during 950-1250c.e.
- 15. A thin layer of gases that surrounds the earth
Down
- 1. a type of greenhouse gas
- 4. contains the air we breath and weather
- 7. solar radiation passes through atmosphere and warms eart
- 8. releases sulfur dioxide and particulates that block the sun
- 10. 21% of the atmosphere composition
- 13. earth´s temperature drops enough for glaciers to form