Life After People

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Across
  1. 2. (giant people or things/frames of ships, etc.)
  2. 4. energy is emitted as particles or waves
  3. 5. (fall apart or break apart into tiny pieces)
  4. 6. to act on
Down
  1. 1. incombustible, water-soluble, poisonous gas
  2. 3. searching (for dead or missing things)
  3. 4. Physics, Chemistry. of, relating to,
  4. 7. produced by an agency or cause