2. The heaviest elements, including and, sink in the early molten Earth to form the . 3. The lighter elements, including and rise towards the surface and erupt in volcanoes as molten rock.

4. Most scientists believe that the water that formed our oceans came from many, many , which contained water.

5. What type of rock formed the first continents?

6. The giant jigsaw of interlocking pieces that make up Earth’s crust are called what?

7. The tectonic plates “float” on what layer of Earth? (1 point)

8. Evidence for the theory of continental drift was first proposed in 1912 by what German Scientist?

9. Heat escaping from the core creates in the next layer of the Earth, the .

10. How many tectonic plates can be identified on Earth today?

11. When continental crust collides with continental crust at convergent plate boundaries and no subduction occurs, what begins to form?

12. The Himalaya Mountains formed as a result of the collision of what two tectonic plates?