Commentary for Job 38:28

waves of dew Heb. אגלי, waves of גלי, dew, and the “aleph” is superfluous, as in (above 13: 17), “and to my speech (ואחותי) in your ears.” The “aleph” is superfluous at the beginning of the word because it is a noun, and similarly (Ezek. 21:20), “the scream of (אבחת) the sword,” like נבוח, barking, the scream of the sword. Another explanation: is like אַגְנֵי, basins of dew. A type of basins, divisions in which the dew is deposited. The “lammed” is interchangeable with a “nun,” and so in the Book of Ezra (Neh. 13:7), chamber (נִשְׁכָּה) like לִשְׁכָּה.

God asks Job whether he knows the causes of these phenomena or has any control over them.