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Moreno Glacier, Argentina
Published December 6, 2004
Perito Moreno (or Moreno Glacier) is located in the icefields of southern Patagonia and is the centerpiece of the Parque Nacional Los Glaciares. The glacier is also noteworthy as a tourist attraction, due to periodic formation of an ice dam between the main portion of Lago (Lake) Argentino to the northeast and a southern extension of the lake (Brazo Rico).
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Shark Bay, Australia
Published November 29, 2004
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Lake Valencia, Venezuela
Published November 22, 2004
Lago de Valencia (Lake Valencia) is located in north-central Venezuela and is the largest freshwater lake in the country. The lake was formed approximately 2-3 million years ago due to faulting and subsequent damming of the Valencia River. The lake has been completely dry during several discrete periods of its geologic history. Since 1976 Lake Valencia water levels have risen due to diversion of water from neighboring watersheds—it currently acts as a reservoir for the surrounding urban centers (such as Maracay).
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Green Circles—Al Khufrah Oasis, Libya
Published November 15, 2004
Green circles in the desert frequently indicate tracts of agriculture supported by center-pivot irrigation. The Al Khufrah Oasis in southeastern Libya (near the Egyptian border) is one of Libya’s largest agricultural projects, and is an easy-to-recognize landmark for orbiting astronauts aboard the International Space Station. Because only about 2 percent of Libya’s land receives enough rainfall to be cultivated, this project uses fossil water from a large underground aquifer. The Libyan government also has a plan called the Great Man Made River to pump and transport these groundwater reserves to the coast to support Libya’s growing population and industrial development.
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Corrientes, Argentina, and the Parana River
Published November 8, 2004
Corrientes, Argentina (sits on the east bank of the Paraná River, South America’s third largest river. Corrientes is located just inside Argentina, across the river from the southwestern tip of Paraguay.
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Gebel Edmonstone, Egypt
Published November 1, 2004
Gebel (or Mount) Edmonstone is a flat-topped mesa located near the Dahkla Oasis south of Cairo, Egypt. The Oasis is a historically important meeting place of several trade routes connecting different regions of Egypt and Sudan. Gebel Edmonstone is a remnant of an eroding scarp that extends for over 200 kilometers (125 miles) east-southeast to west-northwest (visible in the upper left corner of the image). The flat caprock of both the scarp and Mount Edmonstone is chalky limestone underlain by fossil-bearing shale and fine-grained sedimentary rocks.
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Steam Plume, Mount St. Helens
Published October 25, 2004
Early in October 2004 Mt. St. Helens rumbled back to life with earthquakes, minor eruptions of steam and ash, and renewed growth of the summit lava dome. Fortuitous trajectories of the International Space Station provided the ISS crew excellent views of the area.
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Maipo Volcano, Chile
Published October 18, 2004
The high peaks of the Andes form the backbone of South America and the political border between Chile and Argentina. Formed from the subduction of the Nazca Plate under the South American Plate, the south-central Andes also includes several major volcanoes. One of the most active border volcanoes is Volcan Maipo, located just southeast of Santiago, Chile. This image from the International Space Station shows the volcano near the southern hemisphere spring equinox. The lake, just east of Maipo’s peak, is still ice-covered. However, the increasing temperatures of spring are suggested by a muddy-looking streak near the lower left corner. The streak appears to be a landslide or avalanche that flowed westward down a rugged slope, possibly triggered by instability in the snowpack due to snow melt.
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Lake Teletskoye, Russia
Published October 11, 2004
Lake Teletskoye, one of Siberia’s prime tourist destinations, is a large lake that is nestled in a narrow valley between the snow-capped Al-tyntu (west, at top) and Korbu (east, at bottom) mountain ridges of the Altai Mountains. The lake is nearly 80 kilometers long by 5 kilometers wide and 325 meters deep; it is one of the deepest lakes in the world. But Lake Teletskoye is more than a large, deep lake. It is located within the 9,000 km² Altaisky Zapovednik nature reserve, which helps protect its unspoiled waters.
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Earth from the Moon: A Different Perspective on the Harvest Moon
Published October 4, 2004
Over the stark, scarred surface of the moon, the Earth floats in the void of space, a watery jewel swathed in ribbons of clouds.
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Ad Dahna Sand Cordon, Saudi Arabia
Published September 27, 2004
Astronauts have obtained thousands of detailed images of the world’s remote deserts, helping scientists better understand local geomorphological features in a regional context. Driven by northwesterly winds, sands from northwest Saudi Arabia have accumulated in the center of the country as great rivers of dunes (cordons) that extend for hundreds of kilometers. About 320 kilometers northwest of Riyadh, the steep, almost cliff-like margin of the Ad Dahna cordon casts a shadow (right center; diagonally across the scene). Two types of dune surface appear: the tracery of numerous linear dunes (center) and a featureless sand sheet (lower left). Dark, older rocks (30-65 million years old—top right) underlie the sand sea and crop out northeast of the cordon. Convergent dry river beds appear top right.
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Plankton Bloom in Lake Titicaca
Published September 20, 2004
At an average elevation of 3,812 meters (12,507 feet), Lake Titicaca is one of the highest lakes in the world. The lake is positioned between two major ranges of the Andes Mountain chain and has very limited drainage. The limited outflow of the lake allows for the accumulation of nutrients derived primarily from surrounding communities’ agricultural and sewage waste. The increased nutrient levels can lead to plankton blooms. This astronaut photograph, taken from the International Space Station, captures two such blooms along the eastern shoreline of the lake.
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