GK for kids

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Across
  1. 5. Hottest spot
  2. 7. Sum of all sides
  3. 8. Animal that gives us milk
  4. 9. Closest planet to earth
Down
  1. 1. Aquatic mammal
  2. 2. Mammal that can fly
  3. 3. Deepest ocean
  4. 4. input device
  5. 6. 2nd largest planet