Crossword Puzzle

2. this theory helps geologists predict where volcanic and earthquake activity is going to occur
5. several of these make up the East African rift system
6. _______ ______ in the magma drive plate tectonics
10. all lands
11. Glossopteris Mesosaurus, and Lystrosaurus are examples of a _______
12. these are formed by subduction
14. ______ is a silicate liquid
15. Wegeners hypothesis
17. this person studied the physics of space and its environment in space
19. what do seams form?
20. these are pieces of the Earth's lithosphere

1. this is made up of granite, sedimentary, and metamorphic rocks
3. a _______ boundary can happen in three different ways
4. a _______ boundary occurs along the mid-ocean ridge where new crust gets added
7. this is made up of mafic rocks or sima
8. San Andreas fault is an example of a ______ boundary
9. these may be vertical, horizontal, or inclined at any angle
13. This adds more crust to the ocean floor
16. a large area of land
18. sea-floor spreading and ______ move the ocean floor