Caption: Transverse waves produced by a droplet of water penetrating the surface of a liquid, displacing the water, which pushes upward equally on all sides into a miniature crater. The walls of the crater collapse causing shock waves in the form of concentric rings to spread outward. Equally, the collapsed crater causes water to rush inward to fill the space through which the droplet has just passed. The entry point becomes congested with water, the only outlet being upward in the form of a column, which rapidly becomes unstable (as here). As it sinks beneath its own weight small droplets of water may break away from the tip of the column.
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