Science Cross word Puzzle

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Across
  1. 4. What is the process by which plants make their food?
  2. 5. a substance formed when two or more different elements are chemically combined in a fixed proportion
  3. 6. a part of massive clouds of gas and dust
  4. 8. how many valence electrons are in oxygen
  5. 10. responsible for controlling the movement of blood throughout the body
  6. 12. is the tendency of molecules of different substances to stick together
  7. 15. a substance composed of two or more different pure substances that are not chemically bonded
  8. 17. A tide with a 90-degree angle between the Sun, Earth, and Moon
Down
  1. 1. the attraction of molecules for other molecules of the same kind
  2. 2. diagram we used to measure stars heat and brightness
  3. 3. How many elements are in h20
  4. 6. where is the DNA is stored
  5. 7. Which wave has the highest frequency
  6. 9. how many groups are in the periodic table
  7. 11. It is the powerhouse of the cell
  8. 13. what is the chemical formula for water
  9. 14. what type of element is this
  10. 16. What is the symbol for sodium on the periodic table