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GeographyMediumAsked in: Rajasthan · 3 March 2019

Gully erosion is an advance stage of?

  1. A.Rill erosion
  2. B.Splash erosion
  3. C.Sheet erosion
  4. D.Wind erosion

Correct answer

A. Rill erosion

Explanation

The correct answer is A, Rill erosion. Water erosion of soil moves through a fixed sequence: raindrops first loosen the soil, that is splash erosion; the water then takes off a thin even layer of topsoil, which is sheet erosion; the flow soon gathers into small finger-like channels called rills; and when those rills are cut deeper and wider by running water until a plough can no longer cross them, they become gullies. So a gully is a grown up rill, the advanced stage of rill erosion. The ravines along the Chambal in Rajasthan and Madhya Pradesh are the classic Indian example of badlands made by gully erosion. B is wrong because splash erosion is the first step, the impact of raindrops. C is wrong because sheet erosion comes before rills and removes soil in a uniform layer. D is wrong because wind erosion is a separate agent that lifts dry loose soil, not the parent of a gully. Exam tip: splash, then sheet, then rill, then gully.

Practice Questions

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Q2.GeographyAsked in: CDS · CDS-II 2017, GKMedium

Which of the following statements is/are correct? 1. Himalayan rivers have their origin in the snow-covered areas, hence are dry in winter season. 2. Rivers of the Peninsular Plateau have reached maturity. 3. Himalayan rivers depict all the three stages of normal cycle of erosion. Select the correct answer using the code given below.

  1. A.2 only
  2. B.1 and 3 only
  3. C.2 and 3 only
  4. D.1, 2 and 3
Show answer
Correct answer: C. 2 and 3 only

Himalayan rivers are perennial, so statement 1 is wrong, while statements 2 and 3 are correct. Himalayan rivers such as the Ganga, Indus and Brahmaputra rise from glaciers and snowfields and also get monsoon rain, so they flow all year round, including in winter.

Q3.GeographyAsked in: CDS · CDS-II 2017, GKMedium

Which of the following statements related to latitude are true? 1. Rainfall, temperature and vegetation vary with latitude. 2. The difference between the longest day and the shortest day increases with latitude. 3. Indira Point is located approximately at 6°45' N latitude. Select the correct answer using the code given below.

  1. A.1 and 2 only
  2. B.1 and 3 only
  3. C.2 and 3 only
  4. D.1, 2 and 3
Show answer
Correct answer: D. 1, 2 and 3

All three statements about latitude are true. Latitude decides how directly the Sun's rays strike a place, so temperature, rainfall and the type of vegetation change from the equator towards the poles, from hot, wet rainforests to cold tundra.

Q4.GeographyAsked in: CDS · CDS-II 2017, GKMedium

Which of the following lakes is/are situated in Ladakh? 1. Tso Kar 2. Pangong Tso 3. Tsomgo 4. Tso Moriri Select the correct answer using the code given below.

  1. A.1 only
  2. B.2 and 3
  3. C.1, 2 and 4
  4. D.2 and 4 only
Show answer
Correct answer: C. 1, 2 and 4

Tso Kar, Pangong Tso and Tso Moriri are high-altitude lakes of Ladakh, while Tsomgo lies in Sikkim. Pangong Tso, at about 4,350 metres, is a long, narrow lake that stretches from Ladakh into Tibet, and most of its length lies on the Chinese side.