Tectonic plates

3. A repetition of activity that can be used to theorize with.
6. A hot dense ball in the middle of the earth with iron and nickel.
9. The man that theorized continental drift in 1912 because of the similar fossils, rocks, and that Africa and South America fit together like a puzzle piece!.
12. When two plates collide into each other and one plate subducts the other. This usually forms a trench underwater.
13. A mid ocean ridge over the edges of the Atlantic Ocean.
14. A hot spring that erupts jets of water and vapor into steam in the air.
16. Heat cycles in the air mantle and ocean. Controls plate tectonics movement.
18. When two plates slide against each other.
19. The hard solid rock underneath the land and water.
20. When one plate slips over another.

1. When magma or lava sprouts out from the mantle, or an eruption from volcanoes.
2. A liquid layer of earth also with nickel and iron. Borders inner core and the mantle.
4. Hard and dense magma underneath tectonic plates.
5. When the earth starts to shake violently due to plate tectonics reacting.
7. The theory made by Alfred Wegener that all the continents were once one, and then drifted millions of years after.
8. When two plates meet at their edges.
10. A large slab of rock composed of both the continental and the oceanic lithosphere.
11. When two plates go opposite each other and make a ridge. Forms a mid ocean ridge underwater.
15. Can be formed in convergent plates or divergent plates, but not transform. And it erupts out lava.
17. The speed or time how fast something goes.