Question

Why do you think domes and arches are most prevalent in churches and cathedrals? Why do you think they are not used more in residential construction?

Answer 1

Because it is a "formal religion" symbol and if its used in normal building it will lose its "religous powers"

Answer 2

Answer:

An arch or dome bonded into solid form by a strong inner layer of concrete sits as one unit, exerting its weight downwards rather than outwards. This makes possible such miracles as the 1st-century Pont du Gard or the 2nd-century dome of the Pantheon.