changing earth

2. what name does magma get once it erupts from a volcano
5. what is the massive wave that can be caused by an earthquake called
6. how many major tectonic plates are there
8. where do earthquakes occur most
12. what scale measures the magnitude of an earthquake.
14. what was the name of the massive supercontinent that was comprised of all the other continents.
18. who was the first person to support the theory of continental drift
20. what are the massive moving pieces that make up earth's crust

1. what is hot liquid rock below earth's surface called
3. what is a volcano called if it has erupted or will erupt soon
4. which volcano caused lightning that resulted in the only deaths caused by the volcano
7. which volcano spewed ash instead of lava in 1707
9. what are the edges of plates called.
10. what unusual natural phenomenon do volcanoes produce sometimes
11. what is the theory that the continents started as one big supercontinent but slowly drifted apart
13. what is the name of the major fault in california
15. what boundary occurs when two tectonic plates slide past each other
16. what instrument tracks seismic waves and there frequency
17. how many locations are needed to find the location of an earthquake using seismic waves
19. what is a volcano called if it will no longer erupt