Across
- 1. the layer of rock that forms earths outer core
- 5. a trace of an ancient organism that has been preserved in a rock for up to millions of years
- 6. a plate boundary where two plates move away from eachother
- 8. a plate boundary where 2 plates move towards eachother
- 10. A break or crack in the earths lithosphere along which the rocks move
- 11. a plate boundary where 2 plates move past each other in opposite directions
- 13. the layer of hot solid material between earths crust and core
- 15. the hypothesis that the continents have slowly moved across earths surface
- 16. the theory that pieces of earths lithosphere are in constant motion driven by convection currents in the mantle
- 17. a deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle
Down
- 2. the process by which oceanic crust sinks beneath a deep ocean trench and back into the mantle at a convergent plate boundary
- 3. an undersea mountain chain where new ocean floor is produced
- 4. a layer of molten lava and nickel that surrounds the inner core of earth
- 7. A deep valley that forms where 2 plates move apart
- 9. a dense sphere of solid iron and nickel at the center of the earth
- 12. the name of the single landmass that broke apart 200 million years ago and gave rise to todays continents
- 14. a rigid layer made up of the uppermost part of the mantle
- 18. the soft layer of the mantle on which the lithosphere floats