plate tectonics

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Across
  1. 3. trench: a long narrow depression in the sea bed marking subduction zones and marks the plate boundary's.
  2. 5. crust: the outer layer of the earths surface.
  3. 7. when two tectonic plates rub together shaking the ground above or around.
  4. 9. the side ways and downwards movement of the earths crust.
  5. 10. wave: an elastic wave caused by earth quakes.
  6. 12. spreading: when new oceanic crust id formed from volcanic activity the crust then gradually moves away from the ridge.
  7. 15. forms fissures or breaks
  8. 16. molten rock that is stored below the earth that is realised during eruptions.
Down
  1. 1. tectonics:
  2. 2. drift: is the movement of the continents across the sea bed
  3. 4. mountain that realises lava from the earths core.
  4. 6. an instrument that records earthquakes and there power
  5. 8. the centre of an earthquake
  6. 11. a wave caused by subduction and earth quakes.
  7. 13. crust: the relatively thin part of the ocean floor overlaying the basins
  8. 14. molten rock below the earths surface.