Plate Tectonics
Across
- 4. continents moved slowly to their current location
- 5. the layer of earth on which the crust floats
- 9. seven great land masses on the globe
- 10. supercontinent that incorporated almost all of Earth's landmasses in early geologic time
- 14. is a region where plates meet
- 15. the strong, lower part of the mantle between the asthenosphere and the outer core
- 16. the plastic-like layer below the lithosphere
- 17. the thin, outer surface of the earth
- 18. is the process in which the ocean floor is extended when two plates move apart
- 19. when denser rock is pushed down into the mantle so that it melts back into magma
- 20. very dense type of crust
Down
- 1. it is the largest of all tectonic plates
- 2. boundary where plates slide past each other horizontally along transform faults
- 3. plates that move apart
- 6. current in Earth's mantle that transfers heat in earths interior and is the driving force for plate tectonics
- 7. plate boundaries where two plates come together
- 8. it is made up of two parts – the crust and the rigid upper part of the mantle
- 11. the innermost layer of the earth
- 12. Earth's crust and part of the upper mantle are broken into sections
- 13. portion of the Earth's crust that lies beneath the ocean floor