Plate Motion

2. the place where two plates meet
4. an extinct reptile that lived about 300 million years ago
5. evidence of life from the past, such as fossilized bones, footprints, or leaf prints
7. describes the motion of one tectonic plate relative to another
9. something we observe to be similar over and over again
10. the sudden pushing out of something, such as lava from a volcano
13. a set of interacting parts forming a complex whole
14. the layer of soft, solid rock underneath Earth’s plates
17. ridge an underwater mountain range formed when two plates move apart
18. how often or fast something happens
19. an object, diagram, or computer program that helps us understand something by making it simpler or easier to see
20. hot liquid rock below the surface of Earth
22. a sudden shaking of Earth’s surface
24. moving apart in different directions
28. Earth’s outermost layer of hard, solid rock that is underneath the soil, vegetation, and water

1. one of the very large sections of hard, solid rock that make up Earth’s outer layer
3. a diagram that shows what the inside of something looks like
6. activity 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
8. a natural spring that sends hot water and steam suddenly into the air from a hole in the ground
11. a long, deep indentation in the ocean floor formed when two plates move together
12. any of Earth’s main continuous areas of land, such as Africa, Asia, and North America
15. a feature that forms on the surface of a planet, such as a mountain, channel, or sand dune
16. moving toward the same place
21. to examine in detail for a purpose
23. the slow pulling apart of land that is caused by plate movement
25. the solid part of a rocky planet
26. hot liquid rock on the surface of Earth
27. the outside or top layer of something