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Mumbai, India
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Published February 5, 2007
Mumbai is a megacity, one whose population is more than 10 million. More than 21 million people live in the greater Mumbai metropolitan region.
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Santa Maria Volcano, Guatemala
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Published February 4, 2007
Intermittently active, the Santa Maria Volcano released a plume in mid-January 2007.
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Clouds over Ice
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Published February 3, 2007
In a photo-like satellite image, the faintest of shadows or shading of grey may give them away, but more often, clouds over the poles simply disappear against the background, camouflaged from the satellite’s view by the underlying snow and sea ice. For those trying to track clouds from space, to understand cloud physics, say, or to predict the weather, the problem is frustrating. Only with a combination of visible and invisible wavelengths of light, such as infrared light, do clouds become distinct from the snow and ice below.
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The Top of the Atmosphere
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Published February 2, 2007
Atmospheric gases scatter blue wavelengths of visible light more than other wavelengths, giving the Earth’s visible edge a blue halo. At higher and higher altitudes, the atmosphere becomes so thin that it essentially ceases to exist. Gradually, the atmospheric halo fades into the blackness of space. This astronaut photograph captured on July 20, 2006, shows a nearly translucent moon emerging from behind the halo.
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Haze and Sediment in Bangladesh and India
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Published February 1, 2007
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Breakup of B-15J iceberg in the Ross Sea, Antarctica
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Detailed View of Arctic Sea Ice
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For many years, scientists have expected that climate change will be more rapid and dramatic at the poles than at lower latitudes, an expectation that has been demonstrated both with climate models and recent observations of snow and ice, surface temperatures, vegetation, and permafrost.
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