science

2. when plates collide
5. an area where earthquakes cannot be detected
7. a scale, ranging from 1 to 10, for indicating the intensity of an earthquake
11. the lateral movement of continents resulting from the motion of crustal plates.
13. a longitudinal earthquake wavethat travels through the interiorof the earth and is usually thefirst conspicuous wave to berecorded by a seismograph
15. an unusually large sea wave produced by a seaquake or undersea volcanic eruption
16. any of various instruments for measuring and recording the vibrations of earthquakes
17. the region between the ionosphere and the exosphere and is above the surface of the earth
18. a small earthquake or tremor that follows a major earthquake

1. where the earthquake starts
3. a series of vibrations induced inthe earth's crust by the abruptrupture and rebound of rocks inwhich elastic strain has beenslowly accumulating
4. a theory of global tectonics inwhich the lithosphere is dividedinto a number of crustal plates,each of which moves on theplastic asthenosphere more orless independently to collidewith, slide under, or move pastadjacent plates.
6. a plate boundary that moves apart and creates rifts
8. caused by convergent plate boundaries and contains magma
9. a measure of earthquake intensity with 12 divisions ranging from I to XII
10. a transverse earthquake wave that travels through the interior of the earth and is usually the second conspicuous wave to reach a seismograph
12. the crust and the upper mantle oh the earth
14. the sections that the crust is broken into
19. the outer layer of the earth