Crossword Puzzle

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Across
  1. 1. measured in kilograms
  2. 2. amount of space occupied by a three-dimensional space
  3. 4. Earth pulls all objects toward its center
  4. 6. added to a unit to change the value of the unit
  5. 8. another word for dangerous
  6. 10. a smart guess
Down
  1. 1. the curved level of liquid in a measuring tool
  2. 3. measured in Newtons
  3. 5. the distance between two points
  4. 7. the place where experiments take place
  5. 9. the color of a non-luminous flame