changing earth

4. what is a volcano called if it will no longer erupt
6. what boundary occurs when two tectonic plates slide past each other
7. what name does magma get once it erupts from a volcano
8. which volcano spewed ash instead of lava in 1707
9. who was the first person to support the theory of continental drift
11. what instrument tracks seismic waves and there frequency
13. what was the name of the massive supercontinent that was comprised of all the other continents.
15. what scale measures the magnitude of an earthquake.
16. what unusual natural phenomenon do volcanoes produce sometimes
18. what is a volcano called if it has erupted or will erupt soon
19. how many major tectonic plates are there
20. what are the massive moving pieces that make up earth's crust

1. what are the edges of plates called.
2. which volcano caused lightning that resulted in the only deaths caused by the volcano
3. what is the massive wave that can be caused by an earthquake called
5. how many locations are needed to find the location of an earthquake using seismic waves
10. what is the theory that the continents started as one big supercontinent but slowly drifted apart
12. what is hot liquid rock below earth's surface called
14. what is the name of the major fault in california
17. where do earthquakes occur most