Plate Tectonics
Across
- 1. hardened pieces of lava
- 3. this occurs when rock layers bend under stress
- 4. type of fault common along convergent boundaries
- 5. materials that are made of hot ash and bits of rock
- 7. any place where gas, ash, or melted rock come out of the ground
- 11. the Appalachian Mountains are this kind of mountain
- 12. type of stress that squeezes or pushes rock together
- 13. type of boundary in which two plates move past each other horizontally
- 14. type of volcano with a broad base and gently sloping sides
- 16. type of stress that stretches or pulls rock apart
- 20. directly above the focus on Earth’s surface
- 21. the single large landmass that existed before the continents moved to their present-day location
- 23. the outermost, rigid layer of Earth; divided up into pieces called tectonic plates
- 24. a place within Earth along a fault at which the first motion of an earthquake occurs
- 26. seafloor spreading takes place at mid-ocean ______________
- 28. type of volcano that has alternating layers of hardened lava flows and pyroclastic material
- 30. the crack that forms when large blocks of rock break and move past each other
- 31. opening of a volcano
Down
- 1. large basin-shaped depression that forms due to a collapsed magma chamber
- 2. movement of material due to differences in density
- 6. this national park has a hot spot on land
- 8. region of hot, slow-flowing, solid rock; located between the core and the crust
- 9. the process in which the shaking of an earthquake turns soft soil into liquid mud
- 10. a series of long waves that can travel outward in all directions from the point where an earthquake occurred
- 11. __________ eruptions happen when lava flows from giant cracks in Earth’s surface
- 15. magma that has reached Earth’s surface
- 17. the process by which rocks change shape when under stress
- 18. in the late 1800, he proposed the hypothesis of continental drift
- 19. substance found in magma that determines the force of an eruption
- 22. _________ rebound is the return of rock to its original shape after elastic deformation
- 25. the outermost solid layer of Earth
- 27. type of stress that pushes rocks in parallel but opposite directions
- 29. melted rock