Changing Earth

3. These geological events usually occur at transform plate boundaries or where two plates push together.
8. The process by which heat rises and then sinks as it cools is called _____________.
10. _________ boundaries forms where two plate collide.
14. Evidence for the continental drift theory, involving m________ was observed at Divergent plate boundaries.
15. As the oceanic crust drives under the continental crust a ________ forms at the interface.
16. The age of rocks and _________ of plants is some of the evidence that supported Wegner’s “Theory of Continental Drift”.

1. Oceanic crust is denser than continental crust because it is made of_________.
2. Convergent boundaries are also referred to as ____________ boundaries.
4. These form at convergent plate boundaries and as a result of magma plumes in the crust.
5. This technology was developed during WW2 and allowed for the mapping of the ocean floors.
6. ________ is the process by which the crust is destroyed at convergent plate boundary.
7. When the magma rises to the crust as a result of convection currents, new crust is formed at a __________ boundary.
9. _______ boundaries form when two plate slide against each other in opposite directions.
11. The less dense continental crust is composed of ___________.
12. The Theory of Continental Drift refers to the movement of _________ plates.
13. Regions where volcanoes form in the absence of plate boundaries are known as _______.