Seattle PI: This image shot from the International Space Station shows the snout of the Upsala Glacier (49.88°S, 73.3°W) on the Argentine side of the North Patagonian Icefield. Ice flow in this glacier comes from the north (right in this rotated image). Dark lines of rocky debris (moraine) within the ice give a sense of the slow ice flow from right to left.
The water color in Lago Argentino is related to the glacier flow. The lake receives most of the ice from the glacier and thus receives most of the "rock...