Domes in early central plan churches were used to give the attendants the urge to look up, which symbolized looking up to God.
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It is known as Desalination. Hope that helps :)
The answer to your question is four hundred
These are oil and gas extraction, coal mining, metal ore mining, nonmetallic mineral mining and quarrying, and mining support activities. Of all of these categories, oil and gas extraction remains one of the largest in terms of its global economic importance.
