Science crossword puzzle

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Across
  1. 2. Spherical mirror curved inwards.
  2. 3. Ratio of image height to object height.
  3. 4. Rusting or eating up of metal surfaces.
  4. 6. Spoilage of food containing fats and oils.
  5. 8. Bending of light when entering another medium.
  6. 12. The SI unit of power of lens.
  7. 13. Salivary enzyme that breaks down starch into sugar.
  8. 14. Food pipe muscle movement pushing food down.
Down
  1. 1. Substance showing if a solution is acidic or basic.
  2. 4. Another name for a convex lens.
  3. 5. Process of losing oxygen or gaining electrons.
  4. 7. Red blood pigment that carries oxygen.
  5. 9. Basic filtering unit of the kidney.
  6. 10. Natural dye from lichens used to test acids.
  7. 11. Tiny air sacs in lungs for gas exchange.