Across
- 3. earth's interior between the crust and the core
- 5. the rigid outer part of the earth in the upper mantle also
- 7. the force that attracts a body toward the center of the earth
- 8. Drift a theory that explained continents were together once
- 11. Boundary when the plates slide sideways past each other
- 13. an extended break in in a body of rock
- 14. Boundary when two plates are moving toward each other
- 17. each of the several rigid pieces of the earth’s lithosphere
- 18. trench any long,narrow,steep-sided depression in ocean
- 20. Valley a linear shaped lowland between several highlands
Down
- 1. the sideways and downwards movement of edges of a plate
- 2. Boundary the plate tectonics move away from each other
- 4. the upper layer of the earth’s mantle below lithosphere
- 6. a supercontinent that existed during the late Paleozoic
- 9. ridge underwater mountain range formed by plate tectonics
- 10. the remains or impression of a prehistoric organism persevered
- 12. Wegener a German scientist who proposed the theory of Pangea
- 15. the degree of compactness of the substance
- 16. floor spreading the formation of new areas of oceanic crust
- 19. Tectonics a theory explaining the structure of the earth’s crust