Across
- 3. Cold air has more
- 5. Non-metal bond
- 6. DNA is one of this
- 8. Caused by Earth's uneven heating
- 9. Metal and Non-metal bond
- 10. These types of elements don't bond
- 13. This holds heat longer
- 17. Rarest element on Earth
- 18. Less than 1% of this is in the atmosphere
- 19. The Moon is one
- 20. Made up of protons and neutrons
- 21. Greenhouse gas
- 22. Peanut butter and Spinach have this
- 23. Happens during a full or new moon
- 25. Chlorine is one
- 26. This diagram shows the valence electrons
- 27. Meteorites burn up here
Down
- 1. First day of spring
- 2. The amount of force being pulled down on an object
- 4. Winds that blow from west to east
- 5. Water and sugar are this
- 7. Bread and Pasta have this
- 11. Number of protons
- 12. Partly caused by Earth's orbit
- 14. Space shuttle orbits here
- 15. NaCl?
- 16. Jelly beans is an example of this
- 20. Happens during a First or Last Quarter moon
- 23. Ozone layer is in here
- 24. This is mostly in Earth's atmosphere