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| Barchan | Longitudinal dunes |
| (i) When there is an obstacle in the path of wind, or due to low velocity of wind, the sand gets dropped at some places. Thus, barchans are formed. | (i) When sand is deposited parallel to the direction of wind, longitudinal dunes are formed. |
| (ii) Barchans are crescentshaped dunes. The slope that faces the wind is gentle whereas the opposite slope is steep. | (ii) They appear parallel to the wind direction. Sometimes they are 100km long. |
| (iii) Barchans migrate from one place to another. | (iii) Longitudinal dunes do not migrate but extend in the wind direction. |
| (iv) They are seen in the Great Indian Desert of Rajasthan. | (iv) They are seen in Rub-alKhali desert of Saudi Arabia. |
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