Across
- 3. reproduces with spores
- 5. space snowball with two tails
- 8. put into groups with the same traits
- 9. a falling star
- 13. scientist studying space
- 14. prediction for an experiment
- 15. has gone to space
- 17. plane part to keep all other parts together
- 18. planet with a very dense atmosphere
Down
- 1. use your sense to collect this data
- 2. many different kinds of life
- 4. a relationship to benefit both organisms
- 6. large space rock between Mars and Jupiter
- 7. brothers who made the first flight
- 9. organism reproduces by splitting in two
- 10. the force that slows things down
- 11. the weather associated with low pressure
- 12. a vehicle to drive on another planet
- 16. air takes up _______