Nature

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Across
  1. 4. Tall; it has leaves
  2. 7. Opposite of left
  3. 8. Grey and hard
  4. 9. Smaller than a mountain
  5. 10. People walk along this
Down
  1. 1. Water goes down
  2. 2. People use it to cross from one place to another
  3. 3. Composed of many trees
  4. 5. Opposite of curved
  5. 6. Larger than a river, smaller than the ocean