The Ultimate Science Crossword Puzzle

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Across
  1. 2. Atoms with the same number of protons but a different number of neutrons.
  2. 3. Energy harvest from the ground.
  3. 4. The way a frog gets its food.
  4. 6. Made of DNA.
  5. 8. This chemical bond is created because of the attraction of oppositely charged ions.
  6. 9. Energy harvested by plants and microorganisms.
  7. 10. Energy harvested by the sun.
  8. 11. This thing is very dirty and over 8 million pieces go into the ocean every day.
  9. 13. A basic unit of a chemical element.
  10. 14. An Amphibian that is known for jumping.
  11. 15. Molecule that holds genetic information.
  12. 17. Energy from a source that is not depleted when used.
  13. 19. This is the main character in Earth Day play.
  14. 20. A process when a cell divides into two.
Down
  1. 1. A group of atoms.
  2. 5. A process when a cell divides twice a into four.
  3. 7. This Chemical bond is created from electrons pairing together.
  4. 12. Energy harvested by water.
  5. 16. Dark circle behind the eye.
  6. 18. Energy harvested by air.