Sand dunes are mound-like hills with smooth slopes formed by wind action. When strong winds blow across the desert, they carry sand, which settles and piles up in curved or crescent shapes. These dunes can change shape over time due to shifting winds.
Class 7 Social Science Exploring Society: India and Beyond
Class 7 Social Science Chapter 1 Geographical Diversity of India question answer
Sand dunes are hill-like formations commonly found in deserts. They form when wind carries loose sand particles and deposits them in heaps. Over time, continuous blowing shapes the dunes into crescent, dome or ridge-like forms, depending on wind direction and speed. In the Thar Desert, dunes can rise up to 150 meters. They are not fixed and shift position due to wind. Their shapes are similar to hills, even though they are made entirely of loose sand.
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