gravity & mass

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Across
  1. 6. clue
  2. 7. the amount of space occupied by any soil
  3. 8. what is moving
  4. 9. a guess or a prediction
  5. 11. the amount of heaviness
Down
  1. 1. the amount of something
  2. 2. what isn't moving but it could move
  3. 3. what pulls you to the center or the earth
  4. 4. something that pulls you
  5. 5. a process of a system achieving result
  6. 10. what make things go