Science Extra Credit

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Across
  1. 4. First to hit seismic stations
  2. 5. the uppermost layer of the oceanic portion of the tectonic plates
  3. 7. Made up of iron and nickel and some silicone and oxygen
  4. 8. Second to hit the stations
  5. 10. The upper part of the mantle where convection currents occur
  6. 13. A scientist who specializes in the study of earthquakes
  7. 14. A substance or material through which energy can travel
  8. 15. Made up of iron and nickel
  9. 16. A theory that the lithosphere is split into plates that move over the asthenosphere
  10. 17. Makes up 84% of Earth's volume
  11. 18. Made up of igneous, metamorphic, and sedimentary rocks
  12. 19. An instrument that measures and records details of earthquakes
Down
  1. 1. Bending of waves as they travel through each material
  2. 2. Outermost mechanical layer
  3. 3. Sudden shaking of the ground
  4. 6. The innermost part of the earth
  5. 9. Matter coming together under the influence of gravity
  6. 11. A printout of vibrations caused by earthquakes
  7. 12. Energy waves created by earthquakes
  8. 14. Protects Earth from large meteoroids