Earth: Past, Present, Future Unit Vocabulary

Edit Answers
12345678910111213141516171819
Across
  1. 3. fault A type of fault where rocks slide past each other horizontally.
  2. 5. crust The thick part of the earth's crust that forms the large landmasses.
  3. 8. The Earth's outermost, thinnest layer.
  4. 11. arcs Curved chains of volcanic islands located near a trench.
  5. 12. ridge An underwater mountain range formed by plate tectonics.
  6. 14. A break or crack in the Earth's crust where movement occurs.
  7. 15. The layer of gases surrounding the planet.
  8. 18. core The solid, innermost layer of the Earth made of iron and nickel.
  9. 19. wegener The scientist who first proposed the theory of continental drift.
Down
  1. 1. Molten rock found below the Earth's surface.
  2. 2. spreading The process that creates new oceanic crust at mid-ocean ridges.
  3. 4. tectonics theory The theory that Earth's outer shell is divided into several plates that glide over the mantle.
  4. 6. crust The thin, dense part of the crust found under the oceans.
  5. 7. zone The process where the ocean floor sinks back into the mantle.
  6. 9. A deep valley that forms where two tectonic plates move apart on land.
  7. 10. Molten rock that has reached the Earth's surface.
  8. 12. The largest layer of the Earth, located between the crust and the core.
  9. 13. core The liquid layer of the Earth's core.
  10. 16. A long, narrow ditch in the ocean floor formed by subduction.
  11. 17. The name of the ancient supercontinent where all landmasses were joined.