plate tectonics

1. floor spreading A multi-word term used to describe the movement of oceanic crust at a divergent boundary.
4. The branch of geology that deals with the movement that shapes the earth’s crust.
5. the uppermost solid part of earth's crust.
7. the process in which the crust pushes downward into the mantle at a fault line.
9. A large segment of earth's crust that slowly moves.
10. Ocean Ridges ocean bottom mountain ranges split down the middle by a deep crack.
12. the preserved remains of ancient once-living organisms .
14. V-shaped valleys that are the deepest parts of the oceans where subduction occurs.
15. valley Another name for the deep crack splits fault-block mid-ocean ridge mountains.

2. currents circulatory patterns of heat in the magma believed to be the driving force behind plate movement.
3. Wegener A German scientist who was the first person to build a scientific case to support the theory of continental drift.
6. a type of fault where the crust moves sideway past each other.
8. A type of plate boundary where the plates slowly collide into each other.
11. a type of plate boundary where the plates slowly move apart from each other.
13. slip A type of plate boundary where the plates move horizontally past each other.