Space Cadets

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Across
  1. 2. made liquid by heat;melted
  2. 6. existing everywhere, for all purposes
  3. 7. to keep yourself from doing something
  4. 8. imaginary creatures from outer space
Down
  1. 1. a special form or variant of something
  2. 3. rock containing enough metal(s) to make mining profitable
  3. 4. a large, strongly-built boat or ship for carrying freight or waste
  4. 5. friendly;receptive