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    Images from NASA’s Earth Observatory - NASA Earth Observatory | of | Share this photo

    A Landsat satellite image of the Canadian tundra in the Nunavut territory shows a drumlin field – ridges and ponds formed from a glacier's retreat during the last Ice Age. According to NASA, "no one knows exactly how drumlins form. Competing theories include formation by water or ice flow, or some combination of the two."

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    An International Space Station astronaut's photograph shows Manhattan Island on May 5, 2014. The darker areas in the center of the photo and at the island's southern tip (to the right) are, respectively, the Midtown and Financial District neighborhoods, where tall buildings cast longer shadows in the afternoon light. The Hudson River and the coast of New Jersey runs along the picture's bottom edge.

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    "On November 23, 2014, the Fogo volcano in Cape Verde began erupting for the first time in nineteen years," according to NASA's Earth Observatory. This image of the eruption was captured the same day.

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    The Florida peninsula at night, as seen from the International Space Station in October 2014.

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    A mosaic of six satellite images shot in February 2014 show southern Louisiana's Mississippi River Delta. "While the present course of the Mississippi River brings it southeast of New Orleans, the sharp oxbows at several points along the river show how abruptly it could alter course," according to NASA.

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    An image from NASA's TERRA satellite shows the Leidy Glacier near the northwestern corner of Greenland in August 2012.

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    A February 2015 Landsat image shows a Saharan dust storm blowing towards Europe over the Mediterranean Sea. "In early February 2015, Turkey was buffeted by strong southwesterly winds known locally as lodos. The winds grounded flights, collapsed buildings, and stirred up large waves," according to NASA.

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    A closer view of the Mississippi River (right) and Atchafalaya River (left) near the Louisiana-Mississippi state line in February 2014. C-shaped oxbow lakes mark areas where the rivers used to flow.

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    Nine million cadmium telluride solar modules compose Topaz Solar Farm in San Luis Obispo County in southern California. Topaz is one of the largest photovoltaic power plants in the world. At 9.5 square miles (25.6 square kilometers), the facility is about one-third the size of Manhattan island, or the equivalent of 4,600 football fields.

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    A September 2013 Landsat satellite image shows open-pit iron mines in northern Michigan. The city of Marquette and Lake Superior are visible at upper right; to the south and southeast of the mines are huge tailings ponds, where the mines dump pulverized waste rock.

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    A February 24, 2015 Landsat image shows shipping lanes off the coast of China’s Shandong Peninsula, a gateway to Dalian and Tianjin, two of the world's busiest ports. The area is so congested with shipping traffic that the International Maritime Organization has established shipping lanes to reduce the risk of collisions: northbound ships travel to the east, and southbound ships travel to the west, closer to the peninsula.

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