Tag: rivers and their work

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Multiple choice geography rivers, coasts and glaciation rivers rivers and their work exogenic forces

Which of the following plays important role in chemical weathering?

  1. Temperature

  2. Water

  3. Crystal growth

  4. Frost
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Water plays an important role in chemical weathering. Rock is a mixture of many minerals and water is a universal solvent. Chemical weathering takes place in the areas which receives heavy rainfall. Chemical weathering occurs in the following ways: Carbonation, Solution and Oxidation.

Multiple choice geography rivers, coasts and glaciation rivers rivers and their work exogenic forces

Which one is a type of weathering?

  1. Mechanical weathering

  2. Chemical weathering

  3. Biological weathering

  4. All of above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Breaking or weakening of rocks is a natural phenomenon. It is called weathering. Weathering can be of three type:-
  • Mechanical weathering
  • Chemical weathering
  • Biological weathering
Multiple choice geography rivers, coasts and glaciation rivers rivers and their work exogenic forces

What is rust?

  1. Chemical reaction between oxygen and iron

  2. Chemical reaction between carbon dioxide and iron

  3. Chemical reaction between alkalis and iron

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The iron in the rock comes in contact with water and chemical reaction takes place between iron and oxygen. Hence,a reddish coloured layer forms on the rocks. This is called rust.

Multiple choice geography rivers, coasts and glaciation rivers rivers and their work exogenic forces

When water penetrates through sandstone rocks, the particles get loose and separate from the main rock. What type of weathering is this ?

  1. Granular weathering

  2. Mechanical weathering

  3. Chemical weathering

  4. Biological weathering
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When water penetrates through sandstone rocks, the particles get loose and separate from the main rock. This is called granular weathering.

Multiple choice geography rivers, coasts and glaciation rivers rivers and their work exogenic forces

Lime stone is formed due to chemical precipitation between ____________.

  1. Water and Carbon dioxide

  2. Water and Iron

  3. Water and Alkalis

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Lime stone is formed due to chemical precipitation between water and alkalis. At Wadgaon Darya in Ahmadnagar district, limestones gets precipitated chemically i.e. undergoes chemical weathering. Similarly, because of solution, alkalis in the rock dissolve and make them brittle.

Multiple choice geography rivers, coasts and glaciation rivers rivers and their work exogenic forces

Mechanical weathering is more dominant in the ______.

  1. humid climate

  2. arid climate

  3. temperate climate

  4. polar climate
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The arid or hot desert areas dominated by mechanical weathering. Due to the high diurnal range of temperature in the arid areas, repeated expansion and contraction of the outer layer of the rock takes place. The rocks then disintegrate along these joints and big blocks of rocks are dislodged from the main rock mass and fall down the slope under the impact of gravity.

Multiple choice geography rivers, coasts and glaciation rivers rivers and their work exogenic forces

Breaking or weakening of rocks is called _________.

  1. weathering

  2. erosion

  3. landslide

  4. mass movement
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Weathering refers to the breakdown or disintegration and decomposition of rocks in situ through mechanical and chemical changes in rock. The nature and magnitude of weathering differs from place to place and region to region. 

Multiple choice geography rivers, coasts and glaciation rivers rivers and their work exogenic forces

When water penetrates through the rocks, the particles get loose and separate from the main rock, this type of weathering is called ______________.

  1. chemical weathering

  2. biological weathering

  3. granular weathering

  4. none of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Weathering is a process used to explain the breakdown of the rocks due to exposure to the atmosphere. Weathering down of the rock into small pieces is called disintegration. It is in granular weathering, when water penetrates through the rocks, the particles get loose and separate from the main rock. It is a process where a rock disintegrates due to frost action. The water in the rocks freezes as well as liquify at the same time. The rock disintegrates because of heating and cooling at the same time, which result in the expansion and contraction of minerals in the rock breaking it into small pieces.