pLATE tECTONICS

4. The chemical composition of the crust.
5. The middle mechanical layer of the Earth that is composed entirely of mantle material.
6. The bottom chemical layer of the Earth.
8. Mechanism for Plate Tectonics that involves the Circulation of molten material.
9. The chemical composition of the core.
10. The interior mechanical layer of the Earth that is the bottom layer, solid, and composed of iron.
12. The chemical composition of the mantle.
14. Colliding plates.
16. The top mechanical layer of the Earth that represents tectonic plates.
20. Mechanism for Plate Tectonics that involves the downward pull of plates due to the weight of the slab.

1. The mechanical layer of the Earth that tectonic plates rest on.
2. Theory that describes plate material, how plates move, and the effects of plate movement.
3. Responsible for the theory Continental Drift.
7. The interior mechanical layer of the Earth that is composed of iron and is liquid.
11. Spreading plates.
13. The middle chemical layer of the Earth.
15. Mechanism for Plate Tectonics that involves the separation of plates due to the exiting of magma on the ocean floor causing plates to separate.
17. The outer chemical layer of the Earth.
18. Plates sliding side by side.
19. The study of Earth’s Magnetic Field in the past.