Its mostly a stylistic choice although at one points it was mostly a heat related idea. Hot air rises so having a steep roof allowed for the accumulation of hot air. It was also a good windbreaker so a collection of houses were able to stop a lot of the harsh wind from damaging things.
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I really do not know. I am usually pretty good with this but I don't understand if there is supposed to be a question with it.
Because everyone was at there best moments
If you want your dog to sit on command, you may give him a treat every time he sits for you.
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The biggest causes are vehicle pollution, industrial emissions, thermal power plants, construction dust, waste burning and millions of poor households' use of cheap and dirty fuels such as wood and cow-dung for cooking.