
STS092-722-68
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ISS and Richat Dome, Mauritania: To the right of the
International Space Station, the circular feature in the Mauritanian
desert is Richat dome. The 24-mile- (39-km)-wide structure was formed
by intrusion of molten rock at depth, which domed the overlying rock
layers upward. Rock layers of differing compositions weather away at
different rates, so that concentric ridges have developed within the
structure.
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STS092-703-77
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North Island, New Zealand: Ruapehu (snowy peak) and Tongariro
are active volcanoes that line along a northeasterly line through
North Island, New Zealand; White Island (with plume) in the Bay of
Plenty is the northernmost subaerial volcano of the line. As the
Pacific plate descends beneath the eastern edge of North Island, the
crust of the overriding Australian/Indian plate is stretched. Lava
rises through the weakened crust and the line of active volcanoes
develops. Geothermal energy from volcanic heat is used to generate
power for North Island.
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STS092-711-21
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Wellington, North Island, New Zealand: The city of Wellington
is on Port Nicholson bay at the southern tip of North Island and lies
astride a strand of the Marlborough fault zone (sharp linear break
between darker vegetated and light-colored areas). The structural
style of the Australian/Pacific tectonic plate boundary changes in
the region of the Marlborough zone: the Hikurangi trench system
(subduction zone) along the east side of North Island gives way to
the Alpine fault system (transform zone) through South Island.
Earthquakes are common in the Wellington area, as activity on faults
of either the Alpine or the Hikurangi system can result in ground
movement in the Marlborough zone.
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STS092-703-86
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Grand Canyon, Arizona: The Grand Canyon is the centerpiece of
this northeasterly view across the Colorado Plateau. The 1000-m-deep
canyon was carved during the past two million years, mainly during
the Pleistocene period. Lake Powell is at the northeastern end of the
canyon; Lake Mead (left of center) is at the southwestern end, with
the city of Las Vegas just west of the lake. From Lake Mead the
Colorado River flows southward, defining the California-Arizona
border; small lakes and irrigated agricultural lands mark the river
course. Within the unvegetated uplands at right center are the
darker, forested areas of Black Mesa (ragged outline) and the Chuska
Mts. of Arizona and New Mexico.
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STS092-723-79
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Gulf of Tadjourah, Djibouti: The Gulf of Tadjourah is in the
Afar region of the Horn of Africa, where three great rift systems
interact - the Gulf of Aden, Red Sea, and Ethiopian rifts; the Gulf
is an extension of the Aden rift. Lake Assal (top center) occupies a
rift valley and is the lowest point in Africa (168 m below sea
level); a natural barrier of young lava flows (less than 0.3 million
years old) keeps marine waters of the Gulf of Tadjourah from filling
the depression. Sea water does occasionally spill into Lake Assal,
then evaporates to leave highly reflective salt deposits on the lake
floor, well below sea level. The dark, linear features in the lava
fields are fault escarpments that cast shadows in the afternoon
light; particularly good examples can be seen west (left) of Lake
Assal.
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STS092-712-28
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Red Sea Reefs: Along the Saudi Arabian coast of the Red Sea
(near side) is the Farasan Archipelago; across the Sea, off the coast
of Eritrea, is the Dahlak Archipelago. Corals and other marine
organisms have colonized the margins of submerged fault blocks of the
Red Sea rift; thus, the reefs show the same northerly alignment as
the coastline and the faults onshore. A national marine park has been
proposed for the Dahlak islands, an area with abundant and diverse
fish life, as well as breeding populations of sea turtles. The
Farasan Archipelago, which covers about 600 square kilometers, hosts
the most extensive stand of mangroves in the Red Sea, and seagrass
beds fringing the islands are important nursery grounds for Spanish
mackeral.
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STS092-713-32
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Smog Layer Over Upstate New York: The STS-92 Space Shuttle
astronauts photographed upstate New York at sunset on October 21,
2000. Water bodies (Lake Ontario, Lake Erie, the Finger Lakes, the
St. Lawrence and Niagara Rivers) are highlighted by sunglint (sun
reflecting off the water surface), making for a dramatic and unusual
regional view. The photograph was taken looking toward the
southwest from southern Canada, and captures a regional smog layer
extending across central New York, western Lake Erie and Ohio, and
further west. The layer of atmospheric pollution layer is capped by
an atmospheric inversion, which is marked by the layer of clouds at
the top of the photograph. The astronauts were able to document this
smog event from a variety of vantage points as they orbited over the
northeastern U.S. and southern Canada.
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STS092-324-26
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Smoky Air over North Carolina and Virginia: This photograph
taken from the Space Shuttle Discovery was taken at a slightly
oblique look angle to better view air pollution and other atmospheric
features. The photograph was taken with the Shuttle in a position
over the Atlantic Ocean looking back toward the North Carolina and
Virginia coast. The astronauts used a 35 mm camera and standard color
film. The section of coast shown stretches from the Delmarva
Peninsula on the right to beyond Charleston, South Carolina on the
left. On October 23, 2000, high pressure centered over the
northeastern U.S. had created a capping inversion for aerosols.
Forest fire smoke and industrial air pollution accumulated under the
inversion. The inversion pattern is stronger inland, and the aerosols
are being banked against the Piedmont. Relatively clearer air is
flowing from the ocean over the Carolina coastal plain. Small smoke
plumes from individual fires can also be seen on the ground
stretching from central Virginia to Raleigh, NC.
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STS092-325-35
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Sunset with waning moon over Eastern Europe: This photograph
was taken when the Space Shuttle was in over Eastern Europe on
October 23, 2000. The sun is sun setting at approximately 5:50 pm
local time, and the moon phase is waning toward a new moon on October
27.
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STS092-336-4
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Antenna with the Straits of Gibraltar in the background: This
shot of the SGANT (Space to Ground Antenna) Dish on the international
space station also shows the Straits of Gibraltar in the background.
This narrow channel connects the Atlantic Ocean and Mediterranean
Sea. It is 36 miles (58 km) long and narrows to 8 miles (13 km) in
width between Point Marroquí, Spain, and Point Cires, Morocco.
Oceanographers are interested in the flow through this strait because
the Mediterranean outflow plays an important role in the circulation
of the North Atlantic Ocean, and determine the mass, heat, and salt
balances of the Mediterranean. The flow is complex because waters are
confined in the strait and internal waves formed can have
displacements of up to 50 m.
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