Science Crossword Puzzle

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Across
  1. 2. the bending of light as it moves through one medium into another
  2. 4. the bouncing back of light rays from a surface
  3. 6. the amount of matter in something
  4. 10. the process of changing a substance from a solid to a liquid by adding thermal energy
  5. 13. the ability to do work
  6. 14. anything that has mass and takes up space
  7. 15. the path through which an electric current can flow
  8. 17. energy related to the temperature of an object or a substance
  9. 19. a state of matter in which the substance takes the shape of the container and has an unchanged volume when poured from one container to another
  10. 20. a state of matter in which the substance expands to take both the shape and the volume of its container
  11. 21. a substance or object that allows energy to flow through it easily
Down
  1. 1. energy of motion
  2. 3. energy produced by vibrations
  3. 5. energy that is absorbed or delivered by an electric circuit
  4. 7. a type of mixture in which the particles of one or more substances are dissolved (uniformly dispersed throughout) in another substance
  5. 8. a combination of two or more substances that can be easily separated in some physical way
  6. 9. a form of energy which our eyes can detect
  7. 11. the path through which an electric current cannot flow
  8. 12. a closed conducting circle or loop through which current can flow
  9. 16. a substance or object that does not allow energy to flow through it easily
  10. 18. a state of matter in which the substance has a set shape and size