The Susquehanna River, seen on April 24, 2014, appears as a dark line coursing through this scene in southeastern Pennsylvania. "The cities of York, Lancaster, and Reading lie among agricultural lands. The State capital, Harrisburg, is positioned against the orange folds in the upper left of the image, along the edge of the Appalachian Mountain Ridge and Valley Province," the USGS said.
This Landsat image from Sept. 14, 2013 shows the handiwork of glaciers, which are slow-moving rivers of ice. As they creep across the ground, glaciers scour the landscape, even gouging out craters that form lakes. Here, the glaciers exposed the folded rock layers that form the Labrador Trough of Quebec in Canada.
The Arrecife Alacranes — or Scorpion Reef — is 13 miles (21 km) wide and is considered the largest coral structure in the southern Gulf of Mexico. The reef, formed by a multitude of tiny coral creatures, is seen on Nov. 5, 2014.
Seen on Jan. 28, 2014, the Meta River resembles an artery among capillaries in the human body, the USGS notes. Those capillary-like features indicate dense tree cover along the streams in the rich tropical grassland. The river marks the boundary between Colombia and Venezuela.
Oxbows in Bolivia
The Beni River meanders toward the Amazon River in this satellite image captured on Sept. 29, 2014. At several spots along the river, a meander from the main river was cut off to form curved bodies of water called oxbow lakes.
The Tietê River snakes across image taken on Sept. 2, 2014 near Ibitinga, Brazil. Fields of sugarcane, peanuts and corn can be seen in different stages of development. Actively growing crops are shown in purples and blues, while little or no vegetation growth appears light yellow or white. Urban areas are shown in a dark mustard color.
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