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