Layers of the Earth

2. the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
4. process in which two plates collide and the denser (heavier) ocean plate descends below the other.
7. The boundary between tectonic plates that are sliding past each other horizontally.
9. Process by which new oceanic crust forms as magma rises towards the surface and solidifies at the mid - ocean ridge.
10. extremely deep areas in the ocean that are created by a subducting plate.
11. Underwater mountain range made at divergent plate boundaries.
13. Proposed the continental drift theory in the 1900s.
14. The thin and solid outermost layer of the Earth above the mantle.
15. term for the super continent which contained all the plates together.
16. hot less dense material rises and denser material sinks in the mantle driving plate movement.

1. The soft layer of the mantle on which the tectonic plates move.
3. The solid, outer layer of the Earth that consists of the crust and the rigid upper part of the mantle.
5. Hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations.
6. The theory that the earth is broken into plates and are in motion due to convection currents in the asthenosphere (upper mantle).
8. The boundary formed by the collision of two plates.
12. The boundary between two tectonic plates that are moving away from each other.