The theory of plate tectonics

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Across
  1. 2. Molten rock beneath Earth’s surface.
  2. 5. One plate sinking beneath another into the mantle.
  3. 7. Ancient supercontinent that split into today’s continents.
  4. 8. Deep ocean valley formed at subduction zones.
  5. 9. Plates sliding past each other, causing earthquakes.
  6. 11. Rigid outer shell of Earth, broken into plates.
  7. 12. Plates moving apart, creating new crust.
  8. 15. Heat-driven circulation in the mantle that powers plate motion.
Down
  1. 1. Underwater mountain chain formed at divergent boundaries.
  2. 3. Softer layer beneath lithosphere that allows plate movement.
  3. 4. Plates colliding, forming mountains or subduction zones.
  4. 6. Crack in Earth’s crust where movement occurs.
  5. 10. Sudden shaking caused by plate movement.
  6. 13. Opening where magma erupts onto the surface.
  7. 14. Large slabs of lithosphere that move across Earth’s surface.