Landforms mentioned in powerpoint

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Across
  1. 3. a hill or mountain with a vent to the Earth's crust
  2. 4. tectonics Theory about the Earth's crust movement
  3. 5. a chain of islands clustered together in a sea or ocean
  4. 7. a vast dry piece of land
  5. 8. large areas of almost flat land
Down
  1. 1. a large flowing body of water
  2. 2. large abrupt elevation of the surface of the earth
  3. 6. a large flat area of land which is higher than its surrounds