Science crossword

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Across
  1. 2. A substance made of only one type of atom
  2. 4. Two or more atoms chemically bonded together
  3. 8. An organism that makes its own food
  4. 11. An organism that breaks down dead plants and animals
  5. 12. The average weather in a place over a long period of time
  6. 14. The smallest unit of life
  7. 15. A substance made from two or more different elements
  8. 17. The control center of a cell
  9. 18. A force that pulls objects toward each other
  10. 19. Smallest unit of matter
  11. 20. A change in speed or direction over time
Down
  1. 1. The day-to-day conditions of the atmosphere
  2. 3. An organism that eats plants or animals
  3. 5. The ability to do work or cause change
  4. 6. The process plants use to make food using sunlight
  5. 7. Speed in a specific direction
  6. 9. Living and nonliving things interacting in an area
  7. 10. A push or a pull that can change motion
  8. 13. The movement of Earth’s tectonic plates
  9. 16. How much mass is in a certain volume