Plate Motion

4. hot liquid rock below the surface of Earth
7. an extinct reptile that lived about 300 million years ago
8. one of the very large sections of hard, solid rock that make up Earth’s outer layer
10. an underwater mountain range formed when two plates move apart
12. something we observe to be similar over and over again
14. a long, deep indentation in the ocean floor formed when two plates move together
15. the layer of soft, solid rock underneath Earth’s plates
16. the slow pulling apart of land that is caused by plate movement

1. Earth’s outermost layer of hard, solid rock that is underneath the soil, vegetation, and
2. a set of interacting parts forming a complex whole
3. the place where two plates meet
5. an object, diagram, or computer program that helps us understand something
6. the outside or top layer of something
9. when two plates are moving toward one another
11. when two plates are moving away from one another
13. how often or fast something happens