END OF DAYS Crossword

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Across
  1. 3. the human race; human beings collectively
  2. 4. a small rocky body orbiting the sun
  3. 7. an event involving destruction or damage on an awesome or catastrophic scale.
  4. 8. the planet on which we live
Down
  1. 1. an expert in or student of mathematics.
  2. 2. the physical universe beyond the earth's atmosphere.
  3. 5. an expert in or student of one or more of the natural or physical sciences.
  4. 6. the last day of the world's existence.