Dynamic Earth

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Across
  1. 2. magma that erupts onto Earth's surface.
  2. 7. name given to a supercontinent that began to break apart approximately 200 million years ago.
  3. 9. Wegener’s hypothesis that all continents were once connected in a single large landmass that broke apart about 200 million years ago and drifted slowly to their current positions.
  4. 10. the boundary between two plates that move toward each other.
Down
  1. 1. the process by which new oceanic crust forms along a mid-ocean ridge and older oceanic crust moves away from the ridge.
  2. 3. a deep, underwater trough created by one plate subducting under another plate at a convergent plate boundary.
  3. 4. the boundary between two plates that move away from each other.
  4. 5. molten rock stored below Earth's surface.
  5. 6. theory that Earth’s surface is broken into large, rigid pieces that move with respect to each other.
  6. 8. long, narrow mountain range on the ocean floor; formed by magma at divergent plate boundaries.