Plate Tectonics
Across
- 3. plates move apart, or diverge
- 4. sinking movement of ocean floor back into the mantle
- 5. a molten mixture of rock-forming substances, gases, and water from the mantle
- 8. made of alternating layers of lava flows and ash flows
- 9. a force that changes the shape or volume of rocks
- 10. zipper line chains of undersea mountains
- 14. molten rock flows up through the crack in earths crust and hardens into solid strips of new rock on both sides of the crack
- 17. an area where lava frequently erupts at the surface, independent of plate boundary
- 19. single number that geologists use to assign to an earthquake based on earthquake's size
- 20. dead
- 22. wave or series of waves produced by an earthquake or landslide
- 23. stress that pushes masses of rock in opposite directions in a sideways movement
Down
- 1. plates slip past each other
- 2. a structure that forms in Earth's crust
- 3. sleeping
- 6. an idea that can be tested by experimentation or investigation
- 7. plates come together
- 11. undersea valleys that are the deepest parts of the ocean
- 12. shaking and trembling that results from plate movement
- 13. stress that squeezes rock until it folds or breaks
- 15. ideas that are supported by a vast, diverse array of evidence
- 16. a break in Earth's crust along which rocks move
- 18. once magma reaches the surface
- 21. stress that stretches rocks is that it becomes thinner in the middle