natural resource

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Across
  1. 2. what is the most common natural resource
  2. 3. what is the densest natural resource
  3. 5. a fossil fuel (not coal)
  4. 7. what is coal made of
Down
  1. 1. what is the rarest natural resource
  2. 4. what is the least used natural resource
  3. 6. what is the most used natural resource