Plate Motion

2. a feature that forms on the surface of a planet, such as a mountain, channel, or sand dune
6. something we observe to be similar over and over again
8. an object, diagram, or computer program that helps us understand something by making it
9. an extinct reptile that lived about 300 million years ago
10. Earth’s outermost layer of hard, solid rock that is underneath the soil, vegetation, and
12. or easier to see
13. a natural spring that sends hot water and steam suddenly into the air from a hole in the
15. hot liquid rock below the surface of Earth
17. the sudden pushing out of something, such as lava from a volcano
19. moving toward the same place
20. a set of interacting parts forming a complex whole
23. a diagram that shows what the inside of something looks like
24. to examine in detail for a purpose
25. the slow pulling apart of land that is caused by plate movement
27. the place where two plates meet

1. any of the many processes (such as eruptions and lava flows) in which gas, lava,
3. an underwater mountain range formed when two plates move apart
4. hot liquid rock on the surface of Earth
5. ash are pushed out on the surface of Earth
7. one of the very large sections of hard, solid rock that make up Earth’s outer layer
11. a sudden shaking of Earth’s surface
14. how often or fast something happens
15. the layer of soft, solid rock underneath Earth’s plates
16. moving apart in different directions
18. any of Earth’s main continuous areas of land, such as Africa, Asia, and North America
21. the outside or top layer of something
22. evidence of life from the past, such as fossilized bones, footprints, or leaf prints
26. a long, deep indentation in the ocean floor formed when two plates move together