Across
- 5. the hard, frozen part of a comet
- 7. Neil _________ was the first man on the Moon
- 8. a disturbance in an established rock layer
- 11. ____________ dating measures radioactive isotopes to determine the age of a rock layer
- 12. a bright streak across the sky
- 13. Neptune and Uranus appear this color due to the methane in their atmosphere
- 16. one probe sent to the Moon to measure conditions and gather mineral samples
- 18. ____________ dating compares rock layers to each other
- 19. this telescope uses clear lenses
- 21. the season caused when part of Earth is tilted more toward the Sun
- 22. a meteoroid that strikes Earth
- 23. Venus & Earth both experience a __________ effect due to their atmospheres
- 24. this telescope uses curved mirrors
Down
- 1. a ______ eclipse occurs when the Moon blocks the Sun's light from reaching Earth
- 2. developed the Sun-centered theory of the universe
- 3. the speed of _______ equals 300000 km/s
- 4. the phase right after the New Moon
- 6. large, dark plains of hardened lava on the moon
- 9. the ______ telescope does not require light and looks like a large satellite dish
- 10. the 2nd planet from the Sun
- 14. the _______________ spectrum is energy organized by wavelength
- 15. the 4th planet from the Sun
- 17. one of these equals 1 year
- 20. large planet colored with bands of brown, red, and tan