Plate Motion Unit

3. a long, deep indentation in the ocean floor formed when two plates move together
5. evidence of life from the past, such as fossilized bones, footprints, or leaf prints
6. one of the very large sections of hard, solid rock that make up Earth’s outer layer
7. an extinct reptile that lived about 300 million years ago
8. moving toward the same place
10. a diagram that shows what the inside of something looks like
12. to examine in detail for a purpose
14. how often or fast something happens
16. something we observe to be similar over and over again
17. Earth’s outermost layer of hard, solid rock that is underneath the soil, vegetation, and water
18. moving apart in different directions

1. the sudden pushing out of something, such as lava from a volcano
2. an underwater mountain range formed when two plates move apart
4. any of the many processes (such as eruptions and lava flows) in which gas, lava, and ash are pushed out on the surface of Earth
9. the place where two plates meet
11. the layer of soft, solid rock underneath Earth's plates
13. a feature that forms on the surface of a planet, such as a mountain, channel, or sand dune
15. a sudden shaking of Earth's surface