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Across
  1. 3. dune: a hill formed by wind blowing and depositing sand.
  2. 5. a low area between mountains or hills where streams and rivers often flow.
Down
  1. 1. a high, uplifted area with steep slopes.
  2. 2. an area of raised land that is lower and more rounded on top than a mountain.
  3. 4. an extensive area of level, mostly tree-less, land, often covered by rich soil and tall grasses.