Science

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