ook at the picture above. What happened here? Death-Valley-type faulting dropped the bottom, making space for the lake; during the Ice Age, Death Valley looked like this, too. A giant glacier used to sit here, and water flowing into a hole on the surface fell to the bed and hollowed out a great pothole, seen here. A great volcanic explosion occurred, spreading material across the landscape and leaving a hole. An immense marmot named George, shown here, dug the hole. A sharp bend in a river created a whirlpool that carved the hole now filled by a lake.

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