Sand composition can vary drastically depending on where it’s located. The coastal sands in Hawaii, where Dr. Greenberg is located, are very likely the subjects of his amazing micro-photography. The sand in his images is full of remnants from various tropical sea organisms large and small. The sand on other coasts, depending on the temperature, surf conditions and marine environment, may include a totally different set of rocks, minerals and organic matter.
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Origins: The contradictory explanations of this photograph's origins given in the accompanying text are the first clue that something's amiss here: this image can't have been both "taken by the crew on board the Columbia" and "taken via satellite."
Actually, the notation about this image's having been "taken by the crew on board the Columbia during its last mission" was added only after the fatal break-up of the Space Shuttle Columbia upon its re-entry on 1 February 2003. Well before then, this picture had been circulating as a photograph "taken via satellite, on a cloudless day."
Although this image does accurately depict the landforms described and the positioning of lighted cities to the right of the day-night terminator line, it doesn't represent an actual Earth view one might see from space. This photograph is a digital composite formed by merging multiple images from different sources (primarily satellites), the same technique used to create the stunning iceberg photograph.
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Balazs24 ноя 2016 в 14:00