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Arid Coast of Peru
Published March 21, 2005
Following the last major upheaval of the Andes Mountains, rivers flowing down into the Pacific Ocean have carved dramatic canyons along Peru’s southern coast. In geologic terms, the canyons are relatively young—carved over the past 8 million years. This oblique (off-vertical) image from March 14, 2003, provides a southward look down Peru’s rugged, arid coastline between 15.5 and 17 degrees South latitude. The canyons run from left to right and appear grayer than the surrounding reddish-brown terrain.
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Fringing Coral Reef, Red Sea
Published March 14, 2005
The Sudanese coast of the Red Sea is a well-known destination for diving due to clear water and abundance of coral reefs (or shia’ab in Arabic). Reefs are formed primarily from precipitation of calcium carbonate by corals. (In addition to its commonly used meaning, precipitation can also describe how something dissolved in a solution becomes “undissolved” through chemical or biological processes.) Massive reef structures are built over thousands of years of succeeding generations of coral. In the Red Sea, fringing reefs form on shallow shelves of less than 50 meters depth along the coastline. This astronaut photograph illustrates the intricate morphology of the reef system located along the coast between Port Sudan to the northwest and the Tokar River delta to the southeast.
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Coastal Change, Amazon River Mouth
Published March 7, 2005
Over a period of approximately four years a major island near the mouth of the Amazon River has been dramatically modified as the arms of the river have shifted. Between 2000 and 2005 the channel on the west side of the island has shifted to the northwest by eroding ~200 meters of the mainland shoreline and accreting (sediment on the west side of the island.
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Shenyang, China
Published February 28, 2005
The city of Shenyang is China’s sixth largest city with a population ofover 4 million residents in the urban core. The city is the major industrial, commercial, and cultural center of northeastern China (the region historically known as Manchuria). Its geographic location on the flood plains of the Hun and Liao Rivers ensured an early agrarian economy that was later replaced by industrialization and natural resource extraction. The major portion of the local economy is devoted to industries such as metal smelting, coal mining, and petrochemical processing. Several southeast-trending plumes from industrial facilities are visible in the image.
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Mt. Damavand, Iran
Published February 21, 2005
Located approximately 50 kilometers northeast of Tehran, Mt. Damavand is an impressive stratovolcano that reaches 5,670 meters (18,598 feet) in elevation. Part of the Alborz Mountain Range that borders the Caspian Sea to the north, Damavand is a young volcano that has formed mostly during the Holocene Epoch (over approximately the last 10,000 years). The western flank of the volcano includes solidified lava flows with flow levees—“walls” formed as the side edges of flowing lava cooled rapidly, forming a chute that channeled the hotter, interior lava. Two such flows with well-defined levees are highlighted by snow on the mountainside.
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Solimões-Negro River Confluence at Manaus, Amazonia
Published February 12, 2005
The largest river on the planet, the Amazon, forms from the confluence of the Solimões (the upper Amazon River) and the Negro at the Brazilian city of Manaus in central Amazonas. At the river confluence, the muddy, tan-colored waters of the Solimões meet the “black” water of the Negro River. The unique mixing zone where the waters meet extends downstream through the rainforest for hundreds of kilometers, and is a famous attraction for tourists from all over the world. The tourism contributes to substantial growth in the city of Manaus. Twenty years ago the large park near the city center (center) lay on the eastern outskirts of Manaus.
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Issaouane Erg, Algeria
Published February 7, 2005
he Issaouane Erg (sand sea) is located in eastern Algeria between the Tinrhert Plateau to the north and the Fadnoun Plateau to the south. Considered to be part of the Sahara Desert, the Issaouane Erg covers an area of approximately 38,000 km2. These complex dunes form the active southwestern border of the sand sea.
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Iberá Swamp Topography, NE Argentina
Published January 31, 2005
The central lake in this astronaut photograph is one of hundreds in the Iberá swamplands that were formed by South America’s second largest river, the Paraná. Although this great river now lies 120 kilometers to the north of this area today, its channel has swung over a great “inland delta” in the recent geological past.
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Tsunami Damage, Northwestern Sumatra
Published January 24, 2005
Astronaut photographs illustrate the damage along the southwestern coast of Aceh Province, Indonesia.
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Salalah, Sultanate of Oman
Published January 17, 2005
The city of Salalah is the capital of the Dhofar region of Oman and is known as the “perfume capital of Arabia.” The city is a popular destination for tourism due to the natural attractions of the al Qar mountains (Jabal al Qar, in Arabic) and abundant stands of frankincense trees lining mountain stream courses. These can be seen in this astronaut photograph as green regions in the Jabal al Qar north of the city (located in the center of the image). The beaches and coastline are also major attractions for scuba diving and bird watching.
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Seoul, South Korea
Published January 10, 2005
The city of Seoul (originally known as Hanyang) has been the capital of Korea for more than 600 years. This astronaut photograph illustrates the Seoul urban area at night. Major roadways and river courses (such as the Han River) are clearly outlined by street lights, while the brightest lights indicate the downtown urban core (center of image) and large industrial complexes. One such complex is located at the far left of the image and occupies an island in the Yellow Sea. Very dark regions in the image are mountains or large bodies of water. Nighttime images have been used extensively in urban climate and urban growth research to map the extent of urban (bright) versus rural (dark) regions.
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Howland Island, Pacific Ocean
Published January 4, 2005
Howland Island is a United States possession located in the north Pacific between Australia and the Hawaiian Islands. Prior to 1890, organic nitrate (guano) was mined from the island by both the United States and the British. This tiny island (1.6 km²) is currently part of the U.S. National Wildlife Refuge system, and provides nesting areas and forage for a variety of birds and marine wildlife. The island is composed of coral fragments and is surrounded by an active fringing reef. White breakers encircling the island indicate the position of the reef. Astronauts aboard the International Space Station photograph numerous reefs around the world as part of a global mapping and monitoring program.
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