What are plate tectonics?

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Across
  1. 4. LINE A crack or break in Earth's crust caused by plate movement
  2. 9. Molten rock that rises from inside Earth and can form volcanoes
  3. 10. RING OF FIRE A horseshoe-shaped area around the Pacific Ocean with many earthquakes and volcanoes
  4. 11. CURRENTS The movement of hot material inside the mantle that helps move tectonic plates
  5. 14. The mountain range formed by the collision of the Indian and Eurasian plates
  6. 15. SLIPPAGE When two tectonic plates slide past each other sideways
  7. 16. A place where magma rises through a weakness in the crust and forms volcanoes
  8. 17. PLATES Large pieces of Earth's crust that move slowly across the planet
Down
  1. 1. BOUNDARY When two tectonic plates collide and push against each other
  2. 2. RANGE A landform created when plates collide and force Earth's crust upwards
  3. 3. When one tectonic plate is forced beneath another plate into the mantle
  4. 5. DRIFT The movement of continents over millions of years
  5. 6. TECTONICS The theory explaining the movement of Earth's plates and the changing of continents
  6. 7. The supercontinent where all continents were once joined together
  7. 8. BOUNDARY When two tectonic plates move away from each other
  8. 12. SPREADING The process where new crust forms as plates move apart
  9. 13. The hot, semi-molten layer beneath Earth's crust where plates move