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Файл:ISS-30 Etosha Pan in Namibia.jpg

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Апісанне
English: The Etosha Pan in Namibia is featured in this image photographed by an Expedition 30 crew member on the International Space Station.
  • This photograph shows the white, salt-covered floor of the northwest corner of the great dry lake in northern Namibia known as the Etosha Pan (left margin). Two rivers, the Ekuma and Oshigambo, transport water from the north down to the Etosha Pan proper.
  • In a relatively rare event, water from recent rains has flowed down the larger Ekuma River—in which it appears as a thin blue line within the generally light grey-green floodplain—and fills a lobe of the lake with light green water (lower right quarter of image). Water has also flowed into a small offshoot dry lake where it appears a brighter green (upper right quarter of image).
  • Other smaller lakes at center and top center show red and brown water colors. The different colors of lake water are determined by the interplay of water depth and resident organisms such as algae; the algae color varies depending on water temperature and salinity.
  • A similar process is observed in pink and red floodwaters ponded in Lake Eyre, a usually dry lake in Australia's arid center. In this case it is known that the coloration is indeed due to algae growth.
  • Typically, little river water or sediment reaches the floor of the Etosha dry lake because water seeps into the riverbeds along their courses. The floor of the pan itself is seldom seen with even a thin sheet of water. In this image, there was enough surface flow to reach the pan, but too little to flow beyond the inlet bay. A prior flood event, when water entered the pan via the Oshigambo River, was documented in astronaut imagery in 2006.
  • The straight line that crosses the image from top center to bottom is the northern fence line of Namibia's Etosha National Park. This straight, three-meter-high fence keeps wildlife from crossing into the numerous small farms of the relatively densely populated Owambo region of Namibia, north of the pan. The large Etosha dry lakebed (120 kilometers or 75 miles long) is the center of Namibia's largest wildlife park, a major tourist attraction.
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Крыніца http://spaceflight.nasa.gov/gallery/images/station/crew-30/html/iss030e234965.html
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Іншыя версіі
This image or video was catalogued by Johnson Space Center of the United States National Aeronautics and Space Administration (NASA) under Photo ID: ISS030-E-234965.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.
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This file is in the public domain in the United States because it was created by the Image Science & Analysis Laboratory, of the NASA Johnson Space Center. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (NASA media use guidelines or Conditions of Use of Astronaut Photographs). Photo source: ISS030-E-234965.

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актуальн.00:34, 29 мая 2012Драбніца версіі з 00:34, 29 мая 20124 288 × 2 848 (1 005 KB)Ras67{{Information |Description={{en|1=The Etosha Pan in Namibia is featured in this image photographed by an Expedition 30 crew member on the International Space Station. * This photograph shows the white, salt-covered floor of the northwest corner of the ...

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