My bosley science

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Across
  1. 2. something created by fire
  2. 4. something that starts with H on the periodic table
  3. 6. something made when water meets metal
  4. 7. generally found in a pencil
Down
  1. 1. something used to produce heat with a collar
  2. 3. on the left side of the periodic table
  3. 4. the periodic symbol for water
  4. 5. something when it’s added to oxygen