Across
- 3. study of the earth
- 7. provides medium for plant growth
- 10. held together by its own gravity
- 11. can express hot or cold
- 13. may be referred to as torrid zone
- 14. envelope of gases surrounding the earth
- 17. funnel shaped cloud
- 18. equal 100 centimeters
- 21. smallest fundamental unit of a chemical compound
- 23. a process by which the surface of the earth is worn down
- 24. a group of linked ideas intended to explain something
- 25. area where subsoil is permanently frozen
Down
- 1. deep valley having steep sides
- 2. spills lava that flows downward
- 4. the rise and fall of sea level
- 5. 4th layer of the earths atmosphere
- 6. interchangeable with elevation
- 8. a branch of science used to forecast weather
- 9. rocks changed under great pressure or heat
- 12. measures atmospheric measure
- 15. formed as a result of geological processes
- 16. floats to the bottom
- 19. drainage of water away from land
- 20. the average of weather conditions over time
- 22. collection of tiny water droplets or ice crystals