Unit 21 & 22

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Across
  1. 3. , How loud a sound is
  2. 5. , Openings or spaces
  3. 6. , Natural or man-made substances that are added to soil to increase its ability to support plant growth
  4. 8. , Unit of measurement of the intensity of sound
  5. 12. , Sharpness of a sound
  6. 14. , Loss of hearing
  7. 15. , Disturbing
  8. 16. retention , Ability to hold on to water in soil
Down
  1. 1. , Rocks which contain minerals that can be extracted by mining
  2. 2. , Makes a short, sharp bark or cry
  3. 4. , For a long time
  4. 7. , What an object or a substance feels like
  5. 9. , Loudness of a sound
  6. 10. , Something for the roots of a plant to grip so that the plant stands firm
  7. 11. , Consists of coarse particles
  8. 13. , Stick together in clusters