These images show the drop in water level in the Paraná River, near Rosario, Argentina. The difference is especially apparent in the adjacent marshes, lagoons, and streams of the river delta. Can you guess the span of time separating the photos below? A prolonged period of unusually warm weather and drought caused the decline. The scene here is shown in false color, representing both infrared and visible light, to make it easier to distinguish between water and land. 📷 NASA