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Consider the following statements:
Dunes are formed by the accumulation of Sand.
Dunes are shaped by the movements of Wind.
Live dunes are Constantly on the move.
Which of the statements given above is/are correct?
- a)1 and 2 only
- b)2 and 3 only
- c)1 and 3 only
- d)1, 2 and 3
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
Consider the following statements: Dunes are formed by the accumul...
Explanation:
Dunes are large masses or hills of sand that are formed by the accumulation of sand and shaped by the movements of wind. Live dunes are dunes that are constantly on the move due to wind action. Let's discuss each statement in detail:
Statement 1: Dunes are formed by the accumulation of sand.
Dunes are formed when sand particles accumulate in one area. This accumulation can occur in different ways. For example, sand can be carried by wind or water and deposited in a particular location. Over time, as more sand particles are added, the dune grows in size. The shape and size of the dune depend on various factors such as wind strength and direction, availability of sand, and topography of the area.
Statement 2: Dunes are shaped by the movements of wind.
The movement of wind plays a crucial role in shaping dunes. When wind blows over loose sand, it creates a process called saltation. In saltation, the wind picks up sand particles and carries them a short distance before dropping them back to the ground. This repeated lifting and dropping of sand particles causes the dune to move in the direction of the prevailing wind. As the wind continues to blow, the dune gets reshaped and takes on characteristic features such as crescent-shaped ridges and steep faces on the windward side.
Statement 3: Live dunes are constantly on the move.
Live dunes, also known as active dunes, are dunes that are constantly on the move due to wind action. The movement of the dune occurs as a result of sand being transported by the wind. As the wind blows, it lifts and carries sand particles, causing the dune to migrate in the direction of the wind. This movement can be slow or fast, depending on the wind speed and the availability of sand. Live dunes are dynamic landforms that are constantly changing and evolving over time.
Conclusion:
All three statements are correct. Dunes are formed by the accumulation of sand, shaped by the movements of wind, and live dunes are constantly on the move. These processes are essential in the formation and evolution of dunes in various desert and coastal environments.
Dunes are large masses or hills of sand that are formed by the accumulation of sand and shaped by the movements of wind. Live dunes are dunes that are constantly on the move due to wind action. Let's discuss each statement in detail:
Statement 1: Dunes are formed by the accumulation of sand.
Dunes are formed when sand particles accumulate in one area. This accumulation can occur in different ways. For example, sand can be carried by wind or water and deposited in a particular location. Over time, as more sand particles are added, the dune grows in size. The shape and size of the dune depend on various factors such as wind strength and direction, availability of sand, and topography of the area.
Statement 2: Dunes are shaped by the movements of wind.
The movement of wind plays a crucial role in shaping dunes. When wind blows over loose sand, it creates a process called saltation. In saltation, the wind picks up sand particles and carries them a short distance before dropping them back to the ground. This repeated lifting and dropping of sand particles causes the dune to move in the direction of the prevailing wind. As the wind continues to blow, the dune gets reshaped and takes on characteristic features such as crescent-shaped ridges and steep faces on the windward side.
Statement 3: Live dunes are constantly on the move.
Live dunes, also known as active dunes, are dunes that are constantly on the move due to wind action. The movement of the dune occurs as a result of sand being transported by the wind. As the wind blows, it lifts and carries sand particles, causing the dune to migrate in the direction of the wind. This movement can be slow or fast, depending on the wind speed and the availability of sand. Live dunes are dynamic landforms that are constantly changing and evolving over time.
Conclusion:
All three statements are correct. Dunes are formed by the accumulation of sand, shaped by the movements of wind, and live dunes are constantly on the move. These processes are essential in the formation and evolution of dunes in various desert and coastal environments.
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Community Answer
Consider the following statements: Dunes are formed by the accumul...
Option (d) is the correct answer.
Dunes are the feature of Wind Deposition. They are the Hills of Sand formed by the accumulation of sand and shaped by the movement of winds. The dunes are of two types
Active dunes- also known as Live Dunes, are constantly on the move.
Inactive dunes- They are fixed in nature and rooted with Vegetation.
Dunes are easily seen in Erg Desert which is a Sea of Sand. Dunes have been given a long list of fanciful names because of their great contrast in shape, size and alignment. For e.g. Head dune, tail dune, advance dune, lateral dune, wake dune, star dune, pyramidal dune, sword dune etc.
Statement 1 is correct. Dunes are formed by the accumulation of Sand.
Statement 2 is correct. Dunes are shaped by the movements of Wind.
Statement 3 is correct. Live dunes are Constantly on the move.
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Consider the following statements: Dunes are formed by the accumulation of Sand. Dunes are shaped by the movements of Wind. Live dunes are Constantly on the move. Which of the statements given above is/are correct?a)1 and 2 onlyb)2 and 3 onlyc)1 and 3 onlyd)1, 2 and 3Correct answer is option 'D'. Can you explain this answer?
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