Plate Tectonics

5. any of Earth's main continuous areas of land, such as Africa, Asia, and North America
6. a sudden shaking of Earth's surface
7. a natural spring that sends hot water and steam suddenly into the air from a hole in the ground
9. evidence of life from the past, such as fossilized bones, footprints, or leaf prints
11. the outside or top layer of something
13. layer Earth’s outermost layer of hard, solid rock that is underneath the soil, vegetation, and water
14. the layer of soft, solid rock underneath Earth's plates
15. something we observe to be similar over and over again
18. moving toward the same place
19. a feature that forms on the surface of a planet, such as a mountain, channel, or sand dune
23. section a diagram that shows what the inside of something looks like
25. ridge an underwater mountain range formed when two plates move apart
26. 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

1. a long, deep indentation in the ocean floor formed when two plates move together
2. the slow pulling apart of land that is caused by plate movement
3. hot liquid rock below the surface of Earth
4. one of the very large sections of hard, solid rock that make up Earth’s outer layer
8. the sudden pushing out of something, such as lava from a volcano
10. hot liquid rock on the surface of Earth
12. boundary the place where two plates meet
16. how often or fast something happens
17. to examine in detail for a purpose
20. moving apart in different directions
21. a set of interacting parts forming a complex whole
22. an extinct reptile that lived about 300 million years ago
24. an object, diagram, or computer program that helps us understand something by making it simpler or easier to see