science

4. core very dense, solid center od the Earth that is made of mostly iron with smaller amounts of oxygen, silicon, sulfur, or nickel
7. current cycle of heating, rising, cooling, and sinking that is thought to be the force behind plate tectioncs
8. fault break in rock due to tension forces, where rock above the fault surface moves downward in relation to rock below the fault surface
10. Earth's outermost layer, which varies in thickness from about 5km to 60km and is separated from the mantle by the Moho Discontinuity
11. plastic-like layer below the lithosphere
13. fault break in rock due to shearing forces, where rocks on either side of the fault suface move past each other with little upward or downward movement
14. largest layer inside Earth, lying directly above the outer core and that is made mostly of silicon, oxygen, magnesium, and iron
15. in an earthquake, the point beneath Earth's surface where energy release occurs
17. device used by seimologists to record primary, secondary, suface waves from earthquakes
19. rigid, outermost layer of Earth that is about 100km thick, and is composed of the crust and part of the upper mantle
21. surface along which rocks break and move
22. fault break in rock due to compression forces, where rocks above the fault surface move upward and over the rocks below the fault surface

1. waves energy waves that are produced at and travel outward from the earthquake's focus
2. waves waves that travel outward from an earthquke's focus and move through Earth by causing particles in rocks to vibrate at right angles to the direction of the wave
3. core liquid core that surrounds Earth's solid inner core, and that is made mostly of iron
5. drift hypothesis proposed by Alfred Wegener that the states that continents have moved slowly to their current locations on Earth
6. single large landmass made up of all the continents connected together that broke apart 200 million years ago
9. measure of the energy released by an earthquake
12. scientist who studiesearthquakes and seismic waves
16. waves waves that travel outward from an Earthquake's focus and cause particles in rocks to move back and forth in the same direction the wave is moving
18. point of Earth's surface directely above an earthquake's focus
20. tectonics theory that Earth's crust and upper mantle are broken into sections that move around on a plastic-like layer of the mantle