Adam Clarke's Commentary on the Bible - Job 28:9
He putteth forth his hand upon the rock, - Still there appears to be a reference to mining. Man puts his hand upon the rock, he breaks that to pieces, in order to extract the metals which it contains. He overturneth the mountains - He excavates, undermines, or digs them away, when in search of the metals contained in them: this is not only poetically, but literally, the case in many instances. read more
Adam Clarke's Commentary on the Bible - Job 28:7
There is a path which no fowl knoweth - The instinct of birds is most surprising. They traverse vast forests, etc., in search of food, at a great distance from the place which they have chosen for their general residence; and return in all weathers, never missing their track: they also find their own nest without ever mistaking another of the same kind for it. Birds of passage, also, after tarrying in a foreign clime for six or seven months, return to their original abode over kingdoms and... read more