Environment and natural resources

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Across
  1. 1. You can climb them
  2. 2. Made out of trees
  3. 4. You can burn it
  4. 5. Calm freshwater
  5. 6. The Danube is a...
Down
  1. 1. They can be precious
  2. 3. You walk on it
  3. 4. You can drink it