nature

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Across
  1. 1. a large place inside of a hill or a mountain, bears sleep there in winter
  2. 5. salt water that covers most of the earth
  3. 7. a large amount of water falling down
Down
  1. 2. a thigh like a mountain that erupts lava
  2. 3. there are two in Belgrade - Sava and Danube
  3. 4. people go skiing there
  4. 6. a place by the see where people lie in the sand, enjoy the sun, play