Gray clouds are reflected in glassy Crescent Lake in Washington\s Olympic National Park. Lake Crescent was created by the gouging of retreating ice sheets.

• 国家公园图片画廊。灰云反射在玻璃状的新月形湖在华盛顿的奥林匹克国家公园。新月形湖被创造由开槽的再加工的冰盖。