Physical Science Choice Board crossword

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Across
  1. 3. the energy that charges your phone
  2. 8. rocks falling from the top of a mountain
  3. 9. rubbing your hands
Down
  1. 1. K
  2. 2. a cylinder of oxygen used in a hospital
  3. 4. food before you eat it
  4. 5. release of energy from the sun
  5. 6. L
  6. 7. WW2