Week nine crossword

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Across
  1. 2. a substance that conducts heat, electricity or sound
  2. 3. hollowed out like a cup
  3. 5. another word for cleanliness
  4. 7. to come nearer to someone or something
Down
  1. 1. not native to a community
  2. 2. something worn outdoors
  3. 4. can pass through every part
  4. 6. a way to describe a gem