The full moon begins to set behind the Teton Range as fog forms at night in Grand Teton National Park, Wyoming. The Teton Range is the youngest mountain range in the Rocky Mountains, forming between 6 to 9 million years ago. The peaks are fault-block mountains, caused by tilting along the fault where they formed. Grand Teton, visible to the left of the moon, is 13,775 feet (4,199 meters) high. Grand Teton National Park contains another nine peaks that are at least 12,000 feet (3,658 meters) above sea level.
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