Plate Motion

4. to examine in detail for a purpose
6. the place where two plates meet
7. a long, deep indentation in the ocean floor formed when two plates move together
12. the sudden pushing out of something, such as lava from a volcano
15. Earth's outermost layer of hard, solid rock that is underneath the soil, vegetation, and water
16. moving toward the same place
17. a diagram that shows what the inside of something looks like
21. 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
22. hot liquid rock on the surface of Earth

1. moving apart in different directions
2. an extinct reptile that lived about 300 million years ago
3. a sudden shaking of Earth's surface
5. one of the very large sections of hard, solid rock that make up Earth's outer layer
6. something we observe to be similar over and over again
8. a feature that forms on the surface of a planet, such as a mountain, channel, or sand dune
9. an underwater mountain range formed when two plates move apart
10. a natural spring that sends hot water and steam suddenly into the air from a hole in the ground
11. the layer of soft, solid rock underneath Earth's plates
13. a measure of how often or fast something happens
14. evidence of life from the past, such as fossilized bones, footprints, or leaf prints
18. any of Earth's main continuous areas of land, such as Africa, Asia, and North America
19. hot liquid rock below the surface of Earth
20. an object, diagram, or computer program that helps us understand something by making it simpler or easier to see