Across
- 3. something we observe to be similar over and over again
- 4. an object, diagram, or computer program that helps us understand something by making it simpler or easier to see
- 7. 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. the slow pulling apart of land that is caused by plate movement
- 11. the place where two plates meet
- 13. an extinct reptile that lived about 300 million years ago
- 14. one of the very large sections of hard, solid rock that make up Earth’s outer layer
Down
- 1. the outside or top layer of something
- 2. an underwater mountain range formed when two plates move apart
- 5. Earth’s outermost layer of hard, solid rock that is underneath the soil, vegetation, and water
- 6. the layer of soft, solid rock underneath Earth’s plates
- 9. how often or fast something happens
- 10. a set of interacting parts forming a complex whole
- 12. a long, deep indentation in the ocean floor formed when two plates move together