Question

Why do houses on the mountains have
roofs?​

Answer 1

Answer:

Houses are built with level floors and plumb walls. ... Sloping roofs are standard on all houses because water drains on a sloping roof better than it does on a flat roof. This is especially true in areas of snow where it would accumulate to the point that the weight of the snow could collapse the roof

Answer 2

So that the snow falling on them will slide down the roof easily

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