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Doctors Medicines MCQs Q&A

  1. Shale
  2. Quartzite
  3. Marble
  4. Limestone
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Option 2 : Quartzite

Quartzite is most resistant to both chemical and mechanical weathering. It is a hard metamorphic rock. Quartzite is a decorative stone and may be used to cover walls, as roofing tiles, as flooring, and stair steps.

Chemical Weathering is as a result of chemical reactions on the mineral rocks and agents like water or air.

  • Oxygen oxidizes the minerals on the rocks to alteration products.
  • Water turns minerals to clay or dissolves them.
  • All this takes place majorly in hot and humid conditions.
  • Chemical weathering results in formation of new minerals and salts as a result of chemical reaction between rainwater and mineral grains in the rocks.
  • Slightly acidic water results in Chemical weathering.
  • Oxidation, Solution and Carbonation are all Chemical Weathering processes.
  • Oxidation or Rusting is the reaction of rocks with oxygen and hence a chemical weathering process.
  • Solution chemical weathering is when minerals dissolve in acidic solutions. Example - Limestone dissolving in Carbonic Acid.
  • Carbonation involves mixing of Carbon Dioxide with water to make carbonic acid and is a type of chemical weathering.

 

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