P1 Revision

3. The speed at which a galaxy is moving away is proportional to its distance from us
8. The name of our galaxy.
11. If a wave travels at a constant speed, increasing its frequency will __________its wavelength.
12. This was formed about 5000 million years ago.
13. The unit of frequency.
15. When electric lights on Earth make it difficult to see the stars.
18. Small, icy masses that have a highly elliptical orbit of the Sun
19. P waves are
22. If you multiply frequency by wavelength you get
24. When spectrum lines are displaced towards the red end of the spectrum.
27. Large masses that orbit the Sun.
28. The theory that says that the Universe began with a huge explosion 14000million years ago.
30. An example of a longitudinal wave.
31. Old rock is destroyed through...
32. This is approximately 14000 million years old.
33. The estimated age of the Earth.
34. The number of waves produced in one second.
36. The maximum disturbance caused by a wave.
37. Form along colliding plate boundaries.
38. The distance between corresponding points on two adjacent disturbances of a wave.

1. Geologists can see how quickly crust is forming by the _____ of the stripes.
2. If there is not enough mass in the Universe it will keep
4. Large distances in space are measured in
5. Can be caused by earthquakes near coastlines.
6. An example of a transverse wave.
7. S waves are
9. Pulled dust and gas together to start the formation of the solar system.
10. Earthquake wave motions are detected by instruments on Earths surface, such as a
14. These cause magma to rise
16. The lines where plates meet are
17. This is 500 million years older than the Earth.
20. Small, rocky masses that orbit the Sun.
21. A natural hazard
23. If there is too much mass in the Universe gravity will cause it to
25. The Sun gets its energy from nuclear
26. The Earths surface is cracked into several large pieces called
29. Theory proposed by Wegener.
35. Relative brightness and parallax are two ways to measure what in space?