Plate Motion 1

3. a feature that forms on the surface of a planet, such as a mountain, channel, or sand dune
4. section: a diagram that shows what the inside of something looks like
5. an extinct reptile that lived about 300 million years ago
7. a set of interacting parts forming a complex whole
9. one of the very large sections of hard, solid rock that make up Earth’s outer layer
11. moving apart in different directions
13. how often or fast something happens
15. the slow pulling apart of land that is caused by plate movement
16. hot liquid rock below the surface of Earth magma: roca líquida y caliente bajo la superficie de la Tierra
17. a long, deep indentation in the ocean floor formed when two plates move together volcanic 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
19. ridge an underwater mountain range formed when two plates move apart
20. to examine in detail for a purpose
21. the sudden pushing out of something, such as lava from a volcano
23. a natural spring that sends hot water and steam suddenly into the air from a hole in the ground

1. evidence of life from the past, such as fossilized bones, footprints, or leaf prints
2. something we observe to be similar over and over again
4. any of Earth’s main continuous areas of land, such as Africa, Asia, and North America convergent: moving toward the same place
6. the outside or top layer of something
8. an object, diagram, or computer program that helps us understand something by making it simpler or easier to see
10. hot liquid rock on the surface of Earth
12. a sudden shaking of Earth’s surface
14. the layer of soft, solid rock underneath Earth’s plates
18. boundary the place where two plates meet
22. layer Earth’s outermost layer of hard, solid rock that is underneath the soil, vegetation, and water