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Geography ch 3 - Exogenetic Movements Part 1 · Maharashtra Board STD 9 (MSBSHSE - English Medium). 4 questions.

Questions

Write the following concept

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4 questions · self-marked practice — reveal the answer and mark yourself.

Question 12 Marks
Make a record of few landslides that have occured in India and write about them briefly.
Answer
Landslide is a rapid mass movement which is caused majorly due to heavy rains, floods, earthquakes etc. The following are some fatal landsides in India.
  1. Guwahati landslide, Assam:- The landslide took place in the year 1948 due to heavy rains & over 500 people died in this landslide.
  2. Darjeeling landslide, West Negal:- This landslide happened in the year of 1968. It was triggered by floods and thousands of people died due to this landslide.
  3. Malpa landslide, Uttarkhand:- Consecutive landslides occured in August 1998 in village of Mapla due to which 380 people died as an entire village was destroyed in the landslide.
  4. Kedarnath landslide, Uttarakhand:- This landslide took place onune 16, 2013 & was the result of Uttar Khand floods. Over 5700 people were reported dead and over 4200 villages were affected by floods and post-flood landslide.
  5. Malin landslide, Maharashtra:- This landslide occured onuly 30, 2014, in a village in Malin. The landslide occured due to heavy rainfall and around 151 people died and 100 people went missing after the disaster.
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Question 22 Marks
Solution
Answer
  • Some minerals in the rock get dissolved in water.
  • Limestone is formed due to chemical precipitation between water and alkalis.
  • At Wadgaon Darya in Ahmadnagar district, limestone gets precipitated chemically i.e. undergoes chemical weathering again.
  • Similarly, because of solution, alkalis in the rock dissolve and make them brittle.
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Question 32 Marks
Carbonation
Answer
  • Carbonation is a type of chemical weathering.
  • The rainwater travels through the atmosphere before reaching the ground.
  • Carbon dioxide in the air gets mixed in the water in this process and dilute carbonic acid gets formed.
  • For e.g Water + Carbon Dioxide = Carbonic Acid $(H_2O +CO_2 = H_2CO_3)$
  • Materials like limestone get easily dissolved in such acids.
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Question 42 Marks
Block Disintegration
Answer
  • Sometimes both temperature and water are responsible for weathering.
  • The difference in temperature cause contraction and expansion of minerals in the rocks. This leads to widening theoints or cracks in the rocks.
  • Water accumulates in such wideouts and big blocks of rocks separate from each other.
  • This is called Block Disintegration.
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