What Do You Know?

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Across
  1. 9. summer begins on the 21st of this month
  2. 10. tool used to see microorganisms
  3. 11. the planet we live on
  4. 12. during condensation, a gas becomes a _____
  5. 14. phase change in which a liquid becomes a solid
  6. 15. a measurement of heat energy
  7. 17. spring begins on the 21st of this month
  8. 19. to orbit around another object
  9. 21. season with the most daylight
  10. 23. general term referring to the moon
Down
  1. 1. general term referring to the Sun
  2. 2. caused by the moon pulling on the ocean water
  3. 3. velocity is another word for this
  4. 4. what a meteorologist studies
  5. 5. fall begins on the 21st of this month
  6. 6. season with the longest nights
  7. 7. object in space that orbits the earth
  8. 8. tool used to see distant stars
  9. 13. winter begins on the 21st of this month
  10. 16. basic building block of all matter
  11. 18. to spin on an axis
  12. 20. object in space that the Earth orbits around
  13. 22. the faster an object moves, the more _____ energy it has