Assertion (A): Barchans are moon-shaped live dunes. Reason (R): The migration of the barchans is a threat to desert life. - Geography | Shaalaa.com
Assertion (A): Barchans are moon-shaped live dunes. Reason (R): Th…
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POV: Frosted barchan dunes on Mars 🧊🏜️ What you see: sharp, triangular dune crests with dark slip faces; a bluish-white seasonal CO₂ frost coating the windward sides and interdunes; faint dark fans where gas has lofted dust. How it forms: winter CO₂ ice blankets the sand; in spring sunlight, sublimating gas jets burst through, dusting the surface and tracing wind direction; persistent winds sculpt the dunes into barchans (horns point downwind). Scale: dunes are tens of meters high and hundreds
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POV: Frosted barchan dunes on Mars 🧊🏜️ What you see: sharp, trian…
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