Across
- 4. how often or fast something happens
- 6. to examine in detail for a purpose
- 7. a feature that forms on the surface of a planet, such as a mountain, channel, or sand dune
- 11. an extinct reptile that lived about 300 million years ago
- 12. hot liquid rock below the surface of Earth
- 14. 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
- 15. an object, diagram, or computer program that helps us understand something by making it simpler or easier to see
- 19. moving toward the same place
- 21. the layer of soft, solid rock underneath Earth's plates
- 22. the slow pulling apart of land that is caused by plate movement
- 23. layer Earth's outermost layer of hard, solid rock that is underneath the soil, vegetation, and water
- 24. a natural spring that sends hot water and steam suddenly into the air from a hole in the ground
- 25. the sudden pushing out of something, such as lava from a volcano
Down
- 1. one of the very large sections of hard, solid rock that make up Earth's outer layer
- 2. a set of interacting parts forming a complex whole
- 3. one of the seven large landmasses on the earth
- 5. a long, deep indentation in the ocean floor formed when two plates move together
- 7. hot liquid rock on the surface of Earth
- 8. the outside or top layer of something
- 9. evidence of life from the past
- 10. something we observe to be similar over and over again
- 13. a sudden shaking of Earth's surface
- 16. moving apart in different directions
- 17. a diagram that shows what the inside of something looks like
- 18. An underwater mountain range formed where two plates move apart
- 20. boundary the place where two plates meet