Plate tectonics

1. these often happen at convergent boundaries when two plates colide
6. The name of the puzzle
9. an object, diagram, or computer program that helps us understand something by making it simpler or easier to see
10. our teacher
14. when two plates slide next to each other
15. Underwater mountain range formed when two plates move apart
16. when two plates are moving apart from each other
17. the outside or top layer of something
19. Earth’s outermost layer of hard, solid rock that is underneath the soil, vegetation, and water

2. The person who invented the theory of plate tectonics
3. 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
4. When two plates move together and one goes under the other
5. a feature that forms on the surface of a planet, such as a mountain, channel, or sand
7. these happen often at a divergent boundary when the mantle is coming up between two plates
8. something we observe to be similar over and over again
11. There are 12 on earth
12. the layer of soft, solid rock underneath Earth's plates
13. The planet we live on
17. a set of interacting parts forming a complex whole
18. the layer under the land and ocean