Matter

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Across
  1. 1. It is Iron
  2. 3. It makes up everything.
  3. 5. This one has Two or more capital letters.
  4. 7. It is the smallest unit on Earth
Down
  1. 2. This is something that cannot be separated
  2. 4. It flows in a river
  3. 6. It is a mix of other Elements