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