Matter

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Across
  1. 2. Any aspect of a substance which is only seen by means of a chemical reaction.
  2. 4. The amount of matter or substance that makes up an object.
  3. 5. The process when a liquid turns into a solid.
  4. 6. To change from a solid to a liquid usually through the action of heat.
Down
  1. 1. The act of combining.
  2. 3. The process of changing from a liquid to a vapor.