What's the Matter?

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Across
  1. 1. A clear, solid material used for windows and containers
  2. 5. A thin material made from trees that is often used for writing
  3. 7. To transform from a solid to a liquid when hot
  4. 8. A material that has a shape and does not flow
  5. 9. A material that has no shape and moves in the air
  6. 12. To become new or different than before
  7. 13. A shiny material that can be melted and shaped, like silver or gold
  8. 15. To move on the surface of a liquid or in the air
Down
  1. 2. A material that takes the shape of the container it is in and flows
  2. 3. The form of an object, such as round or square
  3. 4. To cause something to become warmer
  4. 6. A material that is easily shaped or molded into containers
  5. 10. To give off heat or light
  6. 11. To take old or used things and make them into new things
  7. 13. What everything on Earth is made up of
  8. 14. To move smoothly, like a stream, without stopping