Science

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Across
  1. 3. The voice box.(6)
  2. 4. gas A gas that occurs over petroleum in reservoirs deep inside the earth.(10)
  3. 5. The sound that produces discordant and displeasing effect in our ears and mind.(5)
  4. 6. A small dose of weakened disease-causing microbe.(7)
  5. 7. The microorganism that lives both inside and outside the body of other organisms.(5)
  6. 9. Anaerobic thermal degradation of wood.(13)
  7. 10. The property of the surfaces in contact that give rise to friction.(9)
  8. 11. Number of oscillations made per second.(9)
  9. 12. An inexhaustible source of energy.(8)
Down
  1. 1. Causes fermentation.(5)
  2. 2. The frictional force exerted by fluids.(4)
  3. 3. It lowers the friction between two surfaces. (11)
  4. 4. flame A blue-coloured flame which produces very little light.(16)
  5. 8. A metallic element that burns with a dazzling whitelight.(9)
  6. 9. The process in which a substance combines with oxygen producing heat and light.(10)