ANSWERS: 3
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I would guess it is because a forest acts like a blanket, and keeps the heat out, whereas a sole tree is exposed to whatever heat is available. A blanket can keep in warmth or cold.
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snow is white it has a nearly 100% refractive effect from the surface area. Tree trunks are dark so the have a very high heat absobtion rate. This in turn causes the Sun's heat to bounce off of the surface of the snow and be absorbed by the tree trunk, the tree heats up and radiates heat out ward in 360 degrees (around the base of the trunk) causing the snow there to melt first. Also, The branches overhead make it so there is less snow to begin with. Next to the tree there is a good water supply and this could make the ground slightly more moist which could cause the snow to melt faster.
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Some good answer here. I wonder if could have something to do with the fact that the tree is alive, and life gives off heat?
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