Earth landforms

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Across
  1. 5. lake
  2. 6. cave
  3. 7. tundra
  4. 9. island
  5. 10. volcano
  6. 12. forest
Down
  1. 1. waterfall
  2. 2. beach
  3. 3. mountain
  4. 4. river
  5. 8. desert
  6. 11. ocean