Nature

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Across
  1. 3. a tall, large piece of land that rises high above the ground
  2. 5. it is a long, flowing body of water
  3. 6. a large body of salty water, smaller than an ocean
Down
  1. 1. a place where water flows over the edge of a steep, high cliff in hills or mountains, and falls into a pool below
  2. 2. a large body of water that is surrounded by land
  3. 4. a huge amount of salty water