Across
- 2. When an object rubs against each other
- 4. Repeating disturbance that transfers energy
- 10. the process that explains the survival of a species and how they can change over time
- 11. Material that waves can travel through
- 12. Force that always pulls objects towards each other
- 13. waves that move at right angles to primary
- 14. Path which an object travels
- 18. waves that can travel through a solid and liquid
- 21. Happens when two equal forces act on opposite sides
- 25. Measures of how many waves pass a point in a certain amount of time
- 27. Rocky bodies covered with craters and have unique features
- 28. 24 hours long
- 29. Location of an object
- 30. the middle layer of earth
Down
- 1. the center of earth
- 3. the age of an object compared to another objects age
- 5. A trait or behavior that helps an organism that lived in the past
- 6. Can have a gaseous and rocky surface and orbits the sun
- 7. The distance between a line through the middle of a wave
- 8. waves that are strong enough to shake the earth
- 9. Happens when two unequal forces act on opposite sides
- 15. Happens when a wave passes through a given point or medium
- 16. Chunks of ice that orbits between Mars and Jupiter
- 17. outer most layer on earth
- 19. Chunks of rock the orbit the solar system
- 20. Distance from the crest of a wave to another
- 22. protects the planet from many meteors that enter it
- 23. preserved remains or traces of an organism that lived in the past
- 24. when no other member of a species is still alive
- 26. Made of ice,methane,ammonia,and dust and orbits closer and closer to the sun