Across
- 2. preserved physical characteristics of the environment that stand in for direct measurements
- 7. what protects us from solar radiation
- 8. Soo we get the right amount of light
- 11. the type of feedback mechanism that increases the effect of the original effect
- 13. the amount of the suns energy that’s reaching the earth at a particular time
- 18. where the magnetic feild off earth is generated from
- 20. type of bacteria that produced the first oxygen via photosynthesis
- 21. a disadvantage of using ice cores
- 22. isotopes looked at in ice cores include oxygen-___ and oxygen-18
Down
- 1. the main protection against the sun’s UV
- 3. the reflectivity of a surface
- 4. the reason we have seasons
- 5. why the earth can support an atmosphere
- 6. bacteria that live deep under the ocean and use chemosynthesis rather than photosynthesis
- 9. means that days and nights aren’t too long or short
- 10. this caught in the ice of glaciers can tell us when volcanoes erupted
- 12. the type of feedback mechanism that cancels out the effect of the original effect
- 14. what a high atmospheric pressure allows earth to have
- 15. the area where the earth lies that is just right for life to form
- 16. study of tree rings to find out the climate of an certain era
- 17. the higher the mass of a planet, the greater the ___
- 19. the plant and animal life of a particular region or period