Continential/Plate tectonics

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Across
  1. 4. Proposed the theory of Continental Drift
  2. 5. When two tectonic plates move away from eachother
  3. 6. Proposed the theory of plate tectonics
Down
  1. 1. Circular currents in the Earth
  2. 2. SuperContinent from about 225 million years ago
  3. 3. Proposed the theory of Sea-Floor Spreading