Plate Tectonics
Across
- 7. core a layer of molten iron (Fe) and nickel (Ni) that surrounds the inner solid core of the Earth
- 8. a trace of an ancient organism that has been preserved in rock
- 9. the layer of hot, solid material between Earth's crust and core.
- 10. valley a deep valley where two plates move apart
- 12. current the movement of fluid, caused by differences in temperature, that transfers heat from one part of the fluid to another
- 13. the transfer of heat within a material or between materials that are touching
- 14. the name of the single land mass that broke apart and gave rise to today's continents
- 15. drift the hypothesis that the continents slowly move across Earth's surface
- 16. A rigid layer made up of the uppermost part of the mantle and the crust.
- 18. the transfer of energy through space
Down
- 1. the layer of rock that forms Earth's outer surface.
- 2. boundary a plate boundary where two plates move away from each other
- 3. trench a deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle
- 4. the transfer of heat by movement of fluid
- 5. ridge an undersea mountain chain where new ocean floor is produced (usually at a divergent boundary)
- 6. Weak, partially melted layer composed of semi-molten rocks
- 11. boundary a plate boundary where two plates move toward each other
- 14. tectonics the theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle
- 17. core a dense sphere of solid iron (Fe) and nickel(Ni) at the center of the Earth