Fil:Dendi Caldera.jpg

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Dendi_Caldera.jpg ‎(639 × 423 pikslar, filstorleik: 122 KB, MIME-type: image/jpeg)

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Skildring Dendi Caldera, Ethiopia is featured in this image photographed by an Expedition 16 crew member on the International Space Station. The Dendi Caldera is located on the Ethiopian Plateau, approximately 86 kilometers to the southwest of Addis Ababa. A caldera is a geological feature formed by the near-total eruption of magma from beneath a volcano, leading to collapse of the volcanic structure into the now-empty magma chamber. This collapse typically leaves a crater or depression where the volcano stood, and later volcanic activity can fill the caldera with younger lavas, ash, pyroclastic rocks, and sediments. While much of the volcanic rock in the area is comprised of basalt erupted as part of the opening of the East African Rift, more silica-rich rock types (characterized by minerals such as quartz and feldspar) are also present. According to scientists, the approximately 4 kilometers wide Dendi Caldera includes some of this silica-rich volcanic rock -- the rim of the caldera, visible in this view, is comprised mainly of poorly-consolidated ash erupted during the Tertiary Period (approximately 65 -- 2 million years ago). A notable feature of the Dendi Caldera is the presence of two shallow lakes formed within the central depression (center). This image also highlights a radial drainage pattern surrounding the remnants of the Dendi volcanic cone. Such patterns typically form around volcanoes, as rainfall has equal potential to move downslope on all sides of the cone and incise channels. No historical volcanic eruptions of Dendi are recorded, however the Wonchi Caldera 13 kilometers to the southwest (not shown) may have been active as "recently" as A.D. 550, say NASA scientists.
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Kjelde http://spaceflight.nasa.gov/gallery/images/station/crew-16/html/iss016e019239.html
Opphavsperson NASA
Kameraposisjon 8° 50′ 23,84″ N, 38° 00′ 49,41″ A Kartographer map based on OpenStreetMap.Dette og andre bilete på denne posisjonen i: OpenStreetMapinfo


This image or video was catalogued by one of the centers of the United States National Aeronautics and Space Administration (NASA) under Photo ID: ISS016-E-019239.

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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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29. desember 2007

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8°50'23.837646532676"N, 38°0'49.411010742158"E

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gjeldande5. april 2008 kl. 15:41Miniatyrbilete av versjonen frå 5. april 2008 kl. 15:41639 × 423 (122 KB)TheDJ{{Information |Description=Dendi Caldera, Ethiopia is featured in this image photographed by an Expedition 16 crew member on the International Space Station. The Dendi Caldera is located on the Ethiopian Plateau, approximately 86 kilometers to the southwe

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