plate tectonic vocabulary

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Across
  1. 2. one of the six or seven land masses on the globe
  2. 6. theory that states that Earth's crust and upper manle are broken into sections, which move around on a special layer of the mantle
  3. 7. a squeezing force
  4. 8. cycle of heating, rising, cooling, and sinking
  5. 12. area where an oceanic plate goes down into the mantle
  6. 13. a system of connected underwater mountain ranges that run throughout the world's oceans. There is a rift valley in the center of the mid-ocean ridge, where magma rises up from the mantle, and pushes out to either side, producing seafloor spreading.
  7. 15. boundary between two plates that are moving apart
  8. 17. rigid layer of Earth's surface made up of the crust and a part of the upper mantle
  9. 19. largest layer of Earth's surface, composed mostly of silicon, oxygen, magnesium, and iron
Down
  1. 1. one large landmass hypothesized to have broken apart about 200 million years ago into continents
  2. 2. hypothesis that continents have moved slowly to their current locations
  3. 3. boundary that occurs when two plates slide past one another
  4. 4. plastic like layer of Earth's surface below the lithosphere
  5. 5. Hess's theory that new seafloor os formed when magma is forced up to the surface at mid-ocean ridges
  6. 9. place where two plates move together
  7. 10. outermost layer of Earth's surface
  8. 11. the bending of rock layers
  9. 14. solid, dense center of the Earth
  10. 16. liquid layer of the Earth's core
  11. 18. a break in the Earth's crust