Dillon's cross word of science!!!

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Across
  1. 4. A force that opposes motion between two objects that touch
  2. 5. return of a wave after striking a surface t
  3. 11. An action that causes an object to accelerate; equal to the product of an object's mass and acceleration
  4. 12. The ability to move or change matter; the ability to do work
  5. 13. energy: The energy that an object possesses because of its motion
  6. 14. variable: A part of an experiment or set of data that is affected by an event or another variable
  7. 16. The maximum distance that the medium of a wave is displaced from its resting position
  8. 18. State of matter that has no definite shape or volume
  9. 19. The measure of how heavy something is for its size; the state or quality of being dense; mass per unit volume
  10. 20. Building block of matter, the smallest particle of an element
Down
  1. 1. Attraction between two objects due to their masses that increases with mass and decreases with distance
  2. 2. The transfer of thermal energy from one object to another due to a difference in temperature
  3. 3. The bending of a wave as it moves around an obstacle or passes through an opening
  4. 6. Process that changes a liquid to a gas at temperatures below the boiling point
  5. 7. A negatively charged particle located outside the nucleus of an atom
  6. 8. Any of 118 known substances that make up matter and cannot be separated into simpler substances; also called chemical element
  7. 9. Substance composed of two or more substances mixed together
  8. 10. State of matter that has a definite volume but no definite shape
  9. 15. A body of facts, statistics, or information
  10. 17. The tendency of matter to resist change to its motion, whether it is moving or at rest