science project.

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Across
  1. 1. animals
  2. 4. bottom of the wave
  3. 7. a chemical reaction that releases energy by light or heat.
  4. 8. a compound or substance that has been purified or prepared, especially artificially.
  5. 13. essential to living organisms
  6. 16. a group of atoms bonded together
  7. 17. the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water.
  8. 18. freezing
  9. 23. a process in living organisms involving the production of energy
  10. 25. hot
  11. 26. top of a wave
  12. 27. Fall
  13. 28. the branch of biology that deals with the relations of organisms
Down
  1. 2. the substance of which a physical object is composed
  2. 3. the bones of a animal
  3. 5. a fart
  4. 6. hard
  5. 9. get from eating food
  6. 10. like water
  7. 11. tool to find how hot something is
  8. 12. a group of atoms bonded together
  9. 14. reactions in which the reactants absorb heat energy from the surroundings to form products
  10. 15. after a test you get a
  11. 19. an organism, especially a soil bacterium, fungus
  12. 20. A basic part of a whole
  13. 21. source of nuclear energy.
  14. 22. science concerned with Earth
  15. 24. is a chemical element with the symbol C and atomic number 6