Amos uses a question to emphasize that these things will certainly happen. Alternate translation: "Yahweh will cause the land to shake, and everyone who lives in it will mourn." (See: [[rc://en/ta/man/jit/figs-rquestion]])
Amos compares the rising and sinking of the waters of the Nile River to how Yahweh will cause the land to shake when he judges the people. (See: [[rc://en/ta/man/jit/figs-simile]])