Nick's crossword

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Across
  1. 3. science that deals with matter and energy
  2. 4. out of balance
  3. 6. response to something that happened
  4. 8. newtons first law
Down
  1. 1. across
  2. 2. someone in space
  3. 5. the act or process of accelerating or increasing speed
  4. 7. increasing speed