Each melting iceberg holds a little bit of mystery in its shape.

Photo by @Chrisburkard ​Each melting iceberg holds a little bit of mystery in its shape. As our sailboat crept along this iceberg in Greenlands Sermilik Fjord, we were able to observe the natural pool that formed inside it, leaving us to ponder what caused this unique feature. Maybe it dragged itself across a rock, flipped over, or simply melted during the midnight sun. Anyone else have any theories?

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