Tectonic Plates

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Across
  1. 3. when two oceanic plates move apart, creating new crust from cooling magma.
  2. 4. how the continents have slowly drifted to their current locations.
  3. 6. when tectonic plates collide or move into each other.
  4. 8. the theory that the Earth's upper mantle are broken in plates that float and move around on the mantle.
Down
  1. 1. the one supercontinent, discovered by Alfred Wegener.
  2. 2. the theory for why the tectonic plates move.
  3. 5. plate boundary where two plates move away from each other.
  4. 7. when two plates slide past each other.