General science

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Across
  1. 1. What is the hardest natural substance on earth?
  2. 6. The process by which plant make their own food
  3. 7. The basic unit of life
  4. 8. The force that pull object towards the centre of the
Down
  1. 2. Smallest unit of matter
  2. 3. Unit of pressure
  3. 4. The metal that is liquid at room temperature
  4. 5. The powerhouse of the cell