Charles Ellicott Commentary Job 36:31

"For by these he judgeth the peoples; He giveth food in abundance." — Job 36:31 (ASV)

For by them — that is, these roots of the sea, these drops of water, these rain-clouds. He judgeth peoples by withholding them, or giveth meat in abundance by sending rain on the earth; or He may use them in excess, to chastise nations by inundations and the like. The change from roots of the sea to bottom of the sea in the Authorised Version has obscured the meaning of them in the next verse, unless, indeed, we understand it generally, by these things.