Things in nature

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Across
  1. 3. a large place that has many trees
  2. 5. a very high part of land
  3. 7. water falls from high place to a lower place
  4. 8. near the ocean, covered with sand
Down
  1. 1. very hot place. covered with sand
  2. 2. a piece of land surrounded by water.
  3. 4. a natural stream of water
  4. 6. an undergound chamber