Across
- 2. the lunar cycle take about this long
- 3. the kind of soil that holds a lot of water
- 5. where petroleum once formed
- 6. original source of energy in a food chain
- 8. an example of a renewable resource
- 9. how light travels
- 14. slows objects down
- 16. this would be beneficial in the tundra
- 18. use this to separate objects that have different relative densities
- 22. this energy causes solids to change to liquids
- 23. an example of a nonrenewable resource
- 24. canyons, valleys form from this
- 29. outermost planet
- 31. silver, gold, copper
- 32. what forms a u-shaped valley
- 33. how sediment is "glued" to form a rock
- 34. a producer that is not a plant
Down
- 1. water vapor turns into droplets
- 3. how sediment is pressed to form a rock
- 4. It rained all weekend
- 7. a key word to identify climate
- 10. this is a thermal conductor but not an electrical conductor
- 11. this is one thing needed to form a fossil fuel
- 12. what happens to light when it passes from air to water
- 13. waxy plant stems would be helpful here
- 15. a shiny object is likely to do this with light
- 17. tools that refract light
- 19. for Earth, it is 24 hours
- 20. to dissolve
- 21. forms at mouth of river from deposition
- 25. time with shortest shado
- 26. birds migrating
- 27. to help
- 28. arrows in a food chain show this
- 30. could turn into coal