plate tectonics
Across
- 2. The layer of hot, solid material between Earth'scrust and core.
- 4. Great landmasses surrounded by oceans
- 5. A trace of an ancient organism that has been preserved in rock.
- 10. The layer of rock that forms the Earth's outer surface.
- 11. A plate boundary where two plates move away from each other.
- 12. The amount of mass in a given space; mass per unit volume.
- 15. The movement of a fluid, caused by differences in temperature, that transfers heat from one part of the fluid to another.
- 16. spreading, The process by which molten material adds new oceanic crust to the ocean floor.
- 17. A plate boundary where two plates move toward each other.
- 19. A rigid layer made up of the uppermost part of the mangle and the crust.
- 20. Scientist who hypothesized that all the continents were one joined together in a single land mass.
Down
- 1. The hypothesis that the continents slowly move across the Earth's surface.
- 3. A plate boundary where two plates move past each other in opposite directions.
- 6. A dense sphere of solid iron and nickel in the center of Earth.
- 7. The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary.
- 8. A layer of molten iron and nickel that surrounds the inner core of Earth.
- 9. The soft layer of the mantle on which the lithosphere forms.
- 13. The study of planet Earth.
- 14. A section of the lithosphere that slowly moves over the asthenosphere, carrying pieces of continental and oceanic crust.
- 18. The material that forms the Earth's hard surface.