Across
- 7. a motion that transfers heat energy in a material.
- 9. occurs where two plates carrying continental crust push together.
- 12. energy transfer by the movement of a material.
- 15. huge underwater mountain ranges.
- 16. large and small slabs of rock made of the lithosphere.
- 18. when one plate sinks beneath another.
- 19. a thin layer of cool rock.
- 20. Earth's thickest layer.
- 21. occurs where plates move apart.
Down
- 1. occurs where plats scrape past each other.
- 2. Alfred Wegener's hypothesis.
- 3. occurs where one plate with oceanic crust sinks, or subducts, under another plate.
- 4. a layer of hotter, softer rock in the upper mantle.
- 5. a switch in direction caused by changes in Earth.
- 6. where heated rock rises in plumes, or thin columns,from the mantle.
- 8. occurs when ocean crust sinks under continental crust.
- 9. occurs where plates push together.
- 10. geologists combined knowledge of Earth's plates, the sea floor, and the asthenosphere.
- 11. a ball of hot, solid metals.
- 13. a layer of liquid metals that surrounds the inner core.
- 14. a gap made by the ridges widening.
- 17. a combination of Earth's crust and very top of the mantle.