Across
- 2. first to reach a seismograph
- 7. the energy release of an earthquake
- 10. The seven steps in the scientific method
- 13. Plates move apart
- 15. boundary of air between air masses
- 19. dioxide needed4 photosynthesis
- 21. A scientific law describes a
- 22. ways the plates move
Down
- 1. amount of water vapor in the air
- 3. highest concentration ofozone
- 4. evaporates from oceans and lakes and rises
- 5. distinguish atmospheric layer
- 6. liquid changing to a gas
- 8. Most of the freshwater on Earth
- 9. nearest to Earth's surface.
- 11. cloudy weather
- 12. Water freezes
- 14. A vast, underwater mountain chain
- 16. process that takes rock into the earth
- 17. the theory the continents are moving
- 18. When a scientist has tested her hypothesis, the next step in scientific inquiry is to
- 20. device used to measure temperature