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The removal of top soil by water or wind is called

A. Soil erosion

B. Soil wash

C. Silting of soil

D. Soil creep

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  1. The element present in the largest amount in rocks and minerals is
  2. Nitrification means
  3. Which of the following elements is non-radioactive?
  4. Brass gets discoloured in air due to the presence of which gas in air
  5. According to Daltons atomic theory the smallest particle which can exist independently is
  6. Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
  7. The hardest substance available on earth is
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  10. Liquefied Petroleum gas (LPG) consists of mainly
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  13. Rust is
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  16. The type of glass used in making prisms and lenses is
  17. The speed of light with the rise in the temperature of the medium
  18. The colour of Emerald is
  19. Lightening cause rainfall because
  20. Water has maximum density at
  21. Glass is made from the mixture of
  22. In an atomic nucleus, neutrons and protons are held together by
  23. The oxide of Nitrogen used in medicine as anaesthetic is
  24. Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere…
  25. The major ingredient of leather is
  26. Polythene is industrially prepared by the polymerisation of
  27. The recent atomic weight scale is based on
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  29. Quartz crystals normally used in quartz clocks etc. is chemically
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