Plate tectonics

4. A theory that scientists made in the late 1960s. It states that Earths plates are always in a slow, constant mostion. They are driven by convection currents
8. A theory that says the continents move across Earths surface at a very slow pace
11. A once living organism that was preserved by a rock
12. Where plates diverge or move apart from each other

1. A deep valley along the ocean floor below where the oceanic crust slowly sinks toward the mantle
2. Where plates converge or come together
3. A section of the lithosphere that gradually moves over the asthenospher. Where it is carrying peices of the oceanic and continental crust
5. The process in which mid ocean ridges add more material to the ocean floor
6. The place where plates slip past each other
7. a super-continent
9. When the ocean floor sinks below a deep ocean trench. Then it moves back to the mantle
10. The process in which seams are form mountain ranges that run across some ocean floors