Plate Tectonics

3. The mechanical layer of the Earth that tectonic plates rest on.
6. The study of Earth’s Magnetic Field in the past.
9. Mechanism for Plate Tectonics that involves the downward pull of plates due to the weight of the slab.
10. The interior mechanical layer of the Earth that is the bottom layer, solid, and composed of iron.
11. The chemical composition of the crust.
13. The bottom chemical layer of the Earth.
15. Spreading plates.
18. Mechanism for Plate Tectonics that involves the separation of plates due to the exiting of magma on the ocean floor causing plates to separate.
19. The middle chemical layer of the Earth.
20. The interior mechanical layer of the Earth that is composed of iron and is liquid.

1. The chemical composition of the mantle.
2. The chemical composition of the core.
4. Theory that describes plate material, how plates move, and the effects of plate movement.
5. The middle mechanical layer of the Earth that is composed entirely of mantle material.
7. Colliding plates.
8. Responsible for the theory Continental Drift.
12. Mechanism for Plate Tectonics that involves the Circulation of molten material.
14. The top mechanical layer of the Earth that represents tectonic plates.
16. The outer chemical layer of the Earth.
17. Plates sliding side by side.