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rainbow Nacreous Clouds - Iceland - Polar stratospheric clouds or PSCs, also known as nacreous clouds (from nacre, or mother of pearl, due to its iridescence), are clouds in the winter polar stratosphere at altitudes of 15,000–25,000 meters. They are best observed during civil twilight when the sun is between 1 and 6 degrees below the horizon. They are implicated in the formation of ozone holes.

rainbow Nacreous Clouds - Iceland - Polar stratospheric clouds or PSCs, also known as nacreous clouds (from nacre, or mother of pearl, due to its iridescence), are clouds in the winter polar stratosphere at altitudes of meters.

Watkins Glen State Park, Watkins Glen, New York

Watkins Glen State Park, Watkins Glen, New York - Beautiful park (caution - take the bus up and walk down - we did the opposite, very tiring.

22 Unbelievable Places that are Hard to Believe Really Exist | Bored Panda

Funny pictures about The Great Tianzi Mountains in China. Oh, and cool pics about The Great Tianzi Mountains in China. Also, The Great Tianzi Mountains in China.