PLATE TECTONICS

6. an opening in the earth's crust through which molten lava, ash, and gases are ejected
9. an earthquake wave in which rock particles vibrate at right angles to the direction of wave travel. It can travel through solids but not through liquids
11. denoting a region free of earthquakes
13. vibrations caused by breaking rocks along fault lines
14. plastic-like layer below the lithosphere
15. large opening formed when the top of a volcano collapses
16. a scientist who studies earthquakes
17. an earthquake wave in which rock particles vibrate parallel to the direction of wave travel. It can travel through solids and liquids
18. the dynamics of plate movement/theory of how continental drift happened
22. an earth vibration generated by an earthquake or explosion
23. thickest layer of the Earth
24. Earths inner layer
26. an earthquake which follows a larger earthquake or main shock and originates in or near the rupture zone of the larger earthquake
28. steep-walled depression around a volcanoes vent
29. cycle of heating, rising, cooling and sinking
33. an area of intense heat, radiation, or activity
35. measure of energy released by an earthquake
37. the fine material that is generated by a pyroclastic flow and rises above it
38. a device used to record earthquake waves
40. an opening in the Earths surface where magma flows out as lava

1. largest intrusive igneous rock bodies/formed from cooled magma
2. a rock body formed when magma is squeezed into a horizontal crack
3. bits of rock or solified lava dropped from the air
4. break in rock due to compression forces
5. point where energy release occurs
7. a steep-sided mount that forms when very viscous lava is extruded from a volcanic vent
8. lava fragments around 1 centimetre in diameter
9. magma forced upwards, cracking and making a new seafloor
10. waves of energy that reach the Earths surface
12. point of Earths centre above earthquakes focus
19. rigid outermost layer/composed of the crust and mantle
20. most common volcano
21. a power seismic sea wave thats born from an earthquake
25. earths outermost layer
27. surface along which rocks break and move
29. movement of the continents
30. break in rock due to tension forces
31. liquid layer surrounding the inner core
32. gaps in the rock layers due to erosion, nondeposition, or both
34. surface along which rocks break and move
36. a rock formed when magma is squeezed into a vertical crack
39. landmass 200 million years ago