chapter seven
Across
- 3. Earth's magnetic field has flipped its polarity many times over the millennia.
- 7. Two plates sliding past each other convergent/plate-boundary two or more lithospheric plates collide subduction
- 9. is a continent that split
- 12. the formation of new areas of oceanic crust, which occurs through the upwelling of magma at mid-ocean ridges and its subsequent outward movement on either side
- 14. scientific theory that explains how major landforms are created as a result of Earth's subterranean movements
- 15. rigid outer part of the earth, consisting of the crust and upper mantle.
Down
- 1. two tectonic plates move away from each other
- 2. is the gradual movement of the continents across the earth's surface through geological time
- 4. is the process by which the North pole is transformed into a South pole and the South pole becomes a North pole
- 5. state of having two opposite or contradictory tendencies, opinions, or aspects
- 6. lithosphere comprises a number of plates
- 8. the pulling force exerted by a cold, dense oceanic plate plunging into the mantle due to its own weight.
- 10. long, seismically active submarine ridge system situated in the middle of an ocean basin and marking the site of the upwelling of magma associated with seafloor spreading
- 11. movement caused within a fluid by the tendency of hotter and therefore less dense material to rise
- 13. sliding plate force is a proposed driving force for plate motion