Climate change (anya)

3. the organisms that first evolved photosynthesis
5. affect the global climate by scattering dust particles that scatter solar radiation and cool the earth
6. occurs when gasses trap heat from the sun in the atmosphere
7. layer of the atmosphere that absorbs and scatters UV radiation
9. frozen seawater on the ocean surface
10. part of the atmosphere with breathable air and weather
14. period of cooling that lasted from 1600-1900 b.c.
17. cycles that determine the shape of earth's orbit and the tilt/wobbling of its axis
20. used to study earth's past atmosphere

1. permanent layers of ice covering portions of land
2. places on the sun that affect the radiation it emits
4. time of abnormally high temperatures between 950-1250 C.E.
8. absorbs and retains carbon dioxide from the atmosphere
11. the study of intentionally changing earth's natural processes
12. the thin layer of gasses that surrounds the earth
13. period when glaciers are expanding
15. the strategy of reducing emissions and stabilizing existing greenhouse gasses to combat climate change
16. period when glaciers are retreating
18. period when the earth's surface temperature is low enough for glaciers to form
19. animal that produces large amounts of methane