Form 4 - Geography

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Across
  1. 4. The zone where two continental plates move toward each other.
  2. 6. Where the crust is thin with a plume of magma forcing its way through fissures in the plate, eventually erupting on the sea floor.
  3. 8. Volcano spread over a wide area with gentle slopes.
  4. 9. A fault where rocks are pushed past each other on a horizontal direction.
  5. 15. Fold Mountains are areas of high land made up of sedimentary and metamorphic rocks that have been forced upwards by .................. forces between two converging plates.
  6. 16. The boundary where two plates are moving toward each other.
  7. 17. An .......... is volcanic activity in which lava, tephra, or gases are released.
  8. 19. Measures the amplitude of the earthquake.
  9. 20. The sudden movement of the earth's crust.
Down
  1. 1. Usually associated with divergence, where some sections of the crust are pulled apart. Also occurs where two plates meet at a convergent margin.
  2. 2. flow of superheated clouds of find ash, gas and lava fragments.
  3. 3. Volcano composed of alternating layers of ash and lava.
  4. 5. Currents in the mantle moving plates.
  5. 7. One limb of the fold is pushed up until it lies on top of the other limb.
  6. 10. Any fold in which one limb is steeper than the other limb.
  7. 11. Ocean crust .......... under continental crust.
  8. 12. The mouth of the volcano
  9. 13. The point of origin beneath the Earth's surface from which seismic waves are emitted.
  10. 14. The boundary where two plates pulling apart.
  11. 18. Compression is so great that the crest of the fold snaps and one limb overrides the other.