8A, 8B, 8D, 8E, 8G, 8H, 8J, 8K

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Across
  1. 2. The ability to cause change or do work
  2. 4. Light bouncing off a surface
  3. 7. system Group of organs that break down food and absorb useful substances
  4. 9. Movement of seeds away from the parent plant
  5. 10. Transfer of heat through direct contact of particles
  6. 11. scale A numbered scale used to measure how acidic or alkaline a substance is
  7. 13. rock Material formed from layers of sediment pressed together over long periods
  8. 14. A curved transparent object that focuses or spreads light
Down
  1. 1. Substances in food that living things need to stay alive and grow
  2. 3. A substance with a pH below seven that can react with metals
  3. 5. A living thing too small to be seen without a microscope
  4. 6. Breakdown of rock at Earth’s surface by physical or chemical processes
  5. 8. The beginning of growth from a seed when conditions are suitable
  6. 11. A microorganism that can cause illness
  7. 12. A material that is usually shiny, strong, and conducts heat and electricity