THE ULTIMATE SCIENCE PUZZLE

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Across
  1. 2. Basic unit of the nervous system.
  2. 4. A push or pull acting on an object.
  3. 5. Force that attracts objects towards Earth.
  4. 6. Smallest units of an element.
  5. 7. Process by which green plants make food.
  6. 10. Gradual destruction of metals by chemical action.
  7. 11. Change in position of an object with time.
  8. 12. Tissue that transports water in plants.
  9. 13. Bouncing back of light from a surface.
Down
  1. 1. Substances that turn red litmus blue.
  2. 3. Process in which substances change into new substances.
  3. 6. Substances that turn blue litmus red.
  4. 7. Tissue that transports food in plants.
  5. 8. Passing of traits from parents to offspring.
  6. 9. Capacity to do work.