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Quick check from College Physics, 14.3 Phase Change and Latent Heat
Why does snow remain on mountain slopes even when daytime temperatures are higher than the freezing temperature?
Answer it in your own words before you look.
Snow is formed from ice crystals and thus is the solid phase of water. Because enormous heat is necessary for phase changes, it takes a certain amount of time for this heat to be accumulated from the air, even if the air is above . The warmer the air is, the faster this heat exchange occurs and the faster the snow melts.
How did it go?