NATURAL FESTURES

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Across
  1. 2. inclined depression of the earth's surface
  2. 4. caused by a process of epigenesis of a river
  3. 5. blue immensity
  4. 6. piece of land away from the continent
Down
  1. 1. Humid environments and full of trees and wild plants
  2. 2. Rock formation ejecting magmatic material
  3. 3. Fall of a stream of water from a great height