Plate Tectonics

3. we get _________ volcanoes mountain ranges and deep-sea trenches
4. this boundary occurs when 2 plate come together and forms either a mountain or a volcano
6. the first wave in an earthquake
8. magma rises because it is ______ dense
9. the San Andreas fault is this many miles long
12. this boundary occurs when 2 plates move apart
15. is a machine that measure the magnitude of an eathquake
17. the second wave in an earthquake
18. the earth has ___ this many plates
19. place where the earth slips

1. can carry either the ocean floor of a continent sometime both
2. the layer we live on
5. there are this many boundaries
7. __________ is how many earthquakes happen a year
10. this person job is to build more stable buildings
11. no plate can________ without another _________
13. plates move this many inches a year
14. this boundary happens when 2 plates slip past each other moving in the opposite direction
15. this is a wave of energy that is released when an earthquake occurs
16. this moves plates