to satisfy the parched wasteland and make it sprout with tender grass?
Hitherto God had put such questions to Job as were proper to convince him of his ignorance and short-sightedness. Now he comes, in the same manner, to show his impotency and weakness. As it is but little that he knows, and therefore he ought not to arraign the divine counsels, so it is but little that he can do, and therefore he ought not to oppose the proceedings of Providence.
Commenting on Job 38:25-41
Out of whose womb came the ice?.... The parent of the rain and dew is the parent of the ice also, and he only; it is therefore called "his ice", his child, his offspring, Psa 147:17. Here the Lord is represented as a mother, and so he is by Orpheus (b) called "metropator", or "mother-father"; and the hoary frost of heaven, who hath gendered it?
As though the desolate ground thirsted for God's showers. Personification. The beauty imparted to the uninhabited desert pleases God, for whom primarily all things exist, and He has ulterior designs in it.