Uneven diurnal heating drives these breezes: daytime slope heating draws warm air up as valley breezes, whereas rapid nighttime cooling sends dense air down as mountain breezes. Barren rock slopes generate colder night breezes.
Class 9 Science Exploration Chapter 13 Important Questions
SQP from Class 9 Science Chapter 13 Earth as a System: Energy, Matter and Life
(i) Breeze formation: Mountain slopes heat rapidly by day, causing warm air to rise and pulling cooler air upward as a valley breeze; at night, slopes radiate heat quickly, sending dense cold air downward as a mountain breeze. (ii) Temperature comparison: The barren rock mountain produces a significantly colder nighttime mountain breeze because barren rocks lose stored heat much faster than vegetated slopes.
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