Across
- 2. A weak spot in the crust where magma has come to the surface
- 4. extremely deep areas in the ocean that are created by a subducting plate
- 7. process in which two plates collide and the denser ocean plate descends below the other
- 11. The boundary between tectonic plates that are sliding past each other horizontally
- 12. thinner, more dense, crust making ocean floor
- 14. The semi-liquid layer of the mantle on which the lithosphere floats.
- 15. the solid, outer layer of the earth that consists of the crust and the rigid upper part of the mantle
- 17. term for the super continent which contained all the plates together
- 18. The boundary between two tectonic plates that are moving away from each other
Down
- 1. The portion of the earth's crust that is less dense than oceanic crust, and is contains earth's land masses.
- 3. Proposed the continental drift theory in the 1900s
- 5. The hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations
- 6. an underwater mountain range made at divergent plate boundaries
- 8. The theory that the earth is broken into plates and are in motion due to convection currents in the asthenosphere (upper mantle)
- 9. The boundary formed by the collision of two plates
- 10. The process by which new oceanic crust forms as magma rises towards the surface and solidifies at divergeny boundaries.
- 13. current a current caused by the rising of heated fluid and sinking of cooled fluid believed to drive plate movement in the mantle of the earth
- 16. A shaking or sliding of the ground. It is caused by the sudden movement of masses of rock along a fault.