History of Earth

3. made of molten (liquid) Iron and Nickel
5. made of solid iron and nickel
9. where two tectonic plates meet
10. the theory that the Earth used to consist of one, large super-continent. The super continent was called Pangea and the theory was introduced by Alfred Wegener
12. Plates Divide
13. the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur
15. Plates Collide
17. crust found on the ocean floor. It is thinner than continental crust

1. crust found on dry land. It is much thicker than oceanic crust
2. a current in a fluid that results from convection. They help move magma, heat, and energy throughout the Earth
4. Holds the convection currents and magma. The mantle is the thickest layer of the Earth
6. A plate boundary where two plates move past each other in opposite directions
7. deep valley along the ocean floor beneath which oceanic crust slowly sinks towards the mantle
8. the rigid outer part of the earth, consisting of the crust and upper mantle
11. the theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle
14. one plate going under another plate
16. an deep valley that forms where two plates move apart, example is the Red Sea