Across
- 3. a gaseous planet, diameter 10x that of earth
- 4. on the surface of mercury and the moon
- 6. used to determine cooling rates of igneous intrusive rocks
- 7. this effect is the driving force for surface ocean currents
- 10. least explosive volcano
- 11. source of energy for sun
- 12. a rain forest is most likely to be near this
- 15. youngest rocks on ocean floor found here
- 16. where stars begin their life cycle
- 17. an increased use of this would increase global temperature
- 18. instrument used to measure earthquake vibrations
- 20. this cycle was made possible by photosynthetic bacteria on earth
- 21. plate boundary with a rift valley
- 22. this has to be available for geothermal energy
- 23. spiral galaxy
Down
- 1. planet formed from light gases
- 2. brighter and farther from earth than planets
- 3. gravel deposited in a silt bed produces this type of rock
- 5. first layer of earths atmosphere
- 7. carbon in the atmosphere is found in this compound
- 8. product of two converging continental plates
- 9. carbon dioxide is used by plants in this process
- 13. massive stars end their lives in this
- 14. richter scale measures this
- 19. energy resource made possible by volcanoes in california