Cross Word of Ch.7-8
Across
- 1. a large section of Earth’s oceanic or continental crust rigid upper mantle that moves around on the asthenosphere
- 3. fracture that occurs when the rock break and that results in relative movement of opposing sides: can form as a result of compression being pulled apart or shear.
- 5. plastic like layer of the Earth on which the lithosphere plates float and move around
- 6. powerful seismic wave that begins over an ocean floor earthquake, can reach 30m in height
- 8. a measure of the energy released by an earthquake
- 9. large ancient landmass that was composed of all the continents joined together.
- 12. Rigid layer of the Earth about 100 km thick made of the crust and part of the upper mantle.
- 15. current current in the Earth’s mantle that transfers heat in the earth’s interior and is driving plate tectonics
- 16. Wave earthquake waves including primary waves, secondary waves and surface waves
- 17. movement of the ground that occurs when rocks inside earth pass their elastics limit break suddenly and experiences elastic rebound
- 18. point deep inside Earth where energy is released causing an earthquake.
Down
- 2. point on earth’s surface directly above an earthquake's focus
- 4. drift Wegener hypothesis that all continents were once connected in a single large mass that broke apart.
- 7. Boundaries boundary moves apart
- 10. Boundaries boundary that moves together
- 11. instrument used to record seismic waves
- 13. Boundaries boundary that slides past one another
- 14. tectonics theory that Earth’s crust and upper mantle are broken into plates that float and move around on a plastic like layer of the mantle.
- 16. spreading Hess’s theory that a new seafloor is formed when magma is forced upward toward the surface at the Mid-Ocean ridge