Across
- 4. material that is below or within the earth's crust
- 7. the gradual movement of the continents
- 8. formation of new areas of oceanic crust
- 9. plates that lie under surface landmass
- 11. the study of the record of earth's magnetic field in rocks
- 13. the remains or impression of a prehistoric organism
- 15. a crack in the earth's crust
Down
- 1. the outer part of the earth consisting of the crust and upper mantle
- 2. mountains that form mainly by the effects of folding
- 3. a measure of mass per volume
- 5. the layer that has so much pressure and heat that the rocks can flow like liquid
- 6. the central portion of the earth
- 10. a type of fault whose relative motion is predominantly horizontal
- 12. an active submarine ridge system that marks the site of the up welling of magma associated with seafloor spreading
- 14. violent shaking of the ground that cause destruction