Random Science Phrases

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Across
  1. 1. Density + Size + Weight
  2. 2. A substance from manganese heptoxide
  3. 4. A way to communicate with hardware
  4. 5. Square
  5. 7. First man on the moon
Down
  1. 1. Potassium Permanganate
  2. 3. Cube
  3. 6. A dark void