If we assume that surface water alone cannot supply all the water we need, which source of fresh water do you think is used by human beings to supplement it?

The ceremonial column.

United states v.  nixon, 418  u.s.  683 (1974),  was  a landmark  united states supreme court case  that resulted in a unanimous  decision  against president richard  nixon, ordering him to deliver tape recordings  and  other subpoenaed materials to a  federal  district  court.