science crossword

1. mountain ranges in the middle of the ocean.
2. a theory of moving plates.
3. the dense metallic center of earth.
6. forms when two plates collide
12. As a slab sinks, it pulls the rest of the plate with it.
13. the outer part if the magnetic field that interacts with charged particles.
14. cold and rigid outermost layer.
15. man who had a theory.
16. The denser plate sinks below the more buoyant plate.
17. the brittle and rocky layer of earth
18. material soft enough to flow.
20. a supercontinent.
21. theory that states that earth's surface is made of rocky plates.

1. occurs and the magnetic fields reverse directions.
4. Rising mantle pushes plates away from each other.
5. the thick middle layer in the solid part of earth.
6. circulation of material caused by differences in temperature.
7. a state in which magnetized objects will point north.
8. a state in which magnetized objects will point south.
9. forms where two plates slide past each other.
10. forms where two plates separate.
11. Process in which new seafloor is made.
19. the plastic layer below the lithosphere that has part of the crust and mantle in it.