Plate Tectonics

1. A chain of volcanic islands formed at an ocean-ocean convergent boundary.
5. A chain of volcanic mountains formed at an ocean-continental convergent boundary.
6. Large supercontinent that existed 250 million years ago.
8. The zone below the lithosphere.
10. Places where new seafloor is being created.
15. What pushes the rest of a plate away from the mid-ocean ridge?
18. Two or more tectonic plates or fragments are near the end of their life cycle.
19. A theory explaining the structure of the earth's crust.

2. The sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
3. The outer part of the Earth's crust.
4. Credited with the theory of Plate Tectonics.
6. Large pieces of earths crust that move due to convection currents.
7. The process by which new organic lithosphere (sea floor) forms as magma rises to Earths surface and solidifies.
9. Plates slide sideways past each other.
11. The hypothesis that the continents slowly move across Earth's surface.
12. Area where magma from the mantle continually breaks through the crust.
13. Credited with the theory of Continental Drift
14. The process by which earths crust breaks apart.
16. Depression formed at a subduction zone.
17. Huge trenches on Earth's seafloor.