| ACROSS 1. column of magma with in the earth
4. study of the earth's plates
6. region within the earth that is below the crust
8. imaging of the interior of the earth
10. shear seismic wave
12. plastic-like layer that flows
14. study of earthquakes
15. Global Seismic Network
16. grid of portable seismic sensors across the US
18. when two plates meet and one dives below the other
19. proposal to explain observations
20. when two plates move apart; creating crust
| DOWN 2. solid part of the earth
3. shape of the earth
5. transfer of heat through a fluid ( gas or liquid)
7. compression seismic wave
9. instrument used to record earthquakes
11. transform fault in California
13. this layer protects life on earth; magnetism
17. 6371 km
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