Plate Techtonics

4. Wegener's idea that all the continents were joined in a super continent
6. a large landmass
7. theory that states earth's plates are in slow constant motion, driven by convection currents in the mantle
12. plates move together
13. The edges of the Earth's plates meet at __________
14. Where pieces of Earth's crust diverge on land, a deep valley called a __________________ forms
15. any trace of an ancient organism that has been preserved in rock

1. plates move apart
2. Wegener's idea that all the continents slowly moved over Earth's surface
3. part of the ocean floor sinks back into the mantle at ________
5. plates slip past each other
8. is the outer layer of the Earth
9. adds more crust to the ocean floor. at the same time older strips of rock move outward from either side of the ridge
10. form long chains of mountains that rise up from the ocean floor
11. a point or line where one region ends and another begins