Across
- 4. the rise in Earth's temperature that results from greenhouse gases
- 5. resources that can be replaced through natural means
- 6. the rock/land realm of earth
- 10. the level at which the rock can hold as much water as possible
- 11. rock layers that store water
- 15. water that is held in the pores (tiny openings) of the rock below the soil
- 19. the water realm of Earth
- 20. people who wander with their herds and have no fixed homes
- 21. an average increase in Earth's temperature
- 22. energy source from steam and heat generated by magma
- 24. the life realm of Earth
- 25. produced when fumes from cars and factories rise into the air and combine with moisture
- 26. materials on or in the earth that people value
Down
- 1. the air realm of Earth
- 2. resources of which there is an unlimited supply, such as wind and sun
- 3. piece of low land reclaimed from a body of water
- 7. a dangerous event that happens in nature
- 8. low place in a mountain range
- 9. to be used again as a raw material
- 12. flat, triangular area formed by material deposited by a river
- 13. resources that can be used up and cannot be replaced
- 14. long period of dry weather with little or no rain
- 16. variety bred from different plants so that certain traits are dominant
- 17. spring that shoots streams of boiling water and steam into the air from time to time
- 18. gases like water vapor and carbon dioxide that keep heat from escaping into space
- 23. hot, melted rock below Earth's crust