Plate Tectonics

6. outermost, rigid later of the Earth
8. type of volcano also called a composite volcano, which is large and has steep slopes
13. the layer between the crust and the core
14. liquid layer of the Earth's core
16. type of volcano that is the biggest and has large gentle slopes
17. simplest type of volcano, conical with low, steep sides and often found on sides of other types of volcanoes
18. this is the region around much of the rim of the Pacific cean where many volcanic eruptions and earthquakes occur
21. boundary where two tectonic plates move away from each other
22. when magma erupts onto the surface it is called this
23. mountains created where two or more continental plates are pushed together. The Himalayan mountains are an example.
24. a long narrow depression in a surface
25. molten rock in the Earth's crust
27. the science of the history of the Earth as recorded in rocks
28. volcano that buried the ancient town of Pompeii in Italy
29. the study of the movement of Earth's crust
30. continental transform fault that extends through California

1. vibration from underground movement along a fault plane
2. type of volcano that is big, round and shaped like a cauldron
3. a crack in the Earth's crust through which gases escape
4. boundary where two tectonic plates slide by each other
5. outermost layer of the Earth
7. the movement of the edge of one tectonic plate under another
9. region formed where two plates move apart and can be found on land or the bottom of the sea
10. process the happens at mid-ocean ridges where new oceanic crust is formed through volcanoes and then gradually moves away from the ridge
11. the theory that continents drift apart
12. the edges where two plates meet
15. a long, underwater ocean ridge created by divergent boundary
16. the branch of geology that studies earthquakes
19. boundary between two colliding tectonic plates
20. a break or crack in the Earth's surface
26. soft later of the mantle