Plate tectonics

4. Break in a body of rock when one block moves relative to another
6. Zone Location where two plates collide and the denser ocean plate descends below the other.
7. type of plate boundary - two plates move slide past each other
9. Boundary The boundary between tectonic plates that are sliding past each other horizontally.
12. _______Drift- the idea that the continents once formed a single landmass, broke up, and drifted to their present locations.
15. The boundary between two tectonic plates that are moving away from each other.
16. Name for the super continent which contained all the plates together.
17. ______- Ridge Underwater mountain ranges where new seafloor is created at a divergent boundary.

1. Openings in Earth's crust from which molten rock, dust, ash, and hot gases flow or erupt
2. tectonics The theory that the Earth is broken into plates and are in motion due to convection currents in the asthenosphere (upper mantle).
3. The boundary formed by the collision of two tectonic plates.
5. sudden, violent movements of the tectonic plates along a boundary
8. The thin and solid outermost compositional layer of the Earth above the mantle.
10. Arc Formed by two oceanic plates colliding volcanoes to form new land
11. type of crust in land, made of granite, less dense
13. Extremely deep areas in the ocean that are created by a subducting plate.
14. type of crust, ocean floor, made of basalt, more dense