crossword puzzle

3. the study of earthquakes and seismic waves that move through the earth
5. is the mostly-solid bulk of Earth's interior
9. is the outermost of the global seismic velocity discontinuities and marks the boundary between the Earths crust and mantle
11. is a seismic surface wave causing the ground to shake in an elliptical motion, with no transverse, or perpendicular, motion.
14. a layer that is made up of iron and nickel
18. who proposed continental drift theory
19. is an area on Earth that exists over a mantle plume
20. an instrument that records the amount of time it takes seismic waves to travel through different layers of the Earth

1. is the fastest kind of seismic wave, and, consequently, the first to 'arrive' at a seismic station
2. the process by which ocean floor sinks beneath a deep-ocean trench and back into the mantle is called
3. a process in which new ocean floor is created as molten material from the earth's mantle rises in margins between plates or ridges and spreads out
4. the boundary where two plates are moving apart
6. it lies between about 100 kilometers (62 miles) and 410 kilometers (255 miles) beneath Earth’s surface
7. a depression in the sea created by subduction
8. where most Divergent plates occur
10. the boundary where two plates are colliding
12. the first kind of surface wave is called a
13. the boundary where plates slide passed each other.
15. are the waves of energy caused by the sudden breaking of rock within the earth
16. is slower than a P wave and can only move through solid rock, not through any liquid medium
17. is the solid, outer part of the Earth, extending to a depth of about 100 kilometers (62 miles)