General quiz

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Across
  1. 4. The largest ocean on Earth
  2. 5. The hardest natural substance
  3. 6. The longest river in the world
  4. 7. The scientist who discovered gravity after seeing an apple fall
  5. 9. The planet known as the "Red Planet."
  6. 10. The largest mammal in the world
  7. 11. The instrument used to measure earthquakes
Down
  1. 1. The process by which plants make their own food
  2. 2. The first Prime Minister of independent India
  3. 3. The gas plants absorb from the air
  4. 8. The fastest land animal