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File:Salt evaporation ponds on San Francisco Bay.jpg

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Summary

Description Salt evaporation ponds formed by salt water impounded within levees in former tidelands on the shores of San Francisco Bay. There are many of these ponds surrounding the South Bay. As the water evaporates, micro-organisms of several kinds come to predominate and change the color of the water. First come green algae, then darkening as orange brine shrimp predominate. Finally red predominates as dunaliella salina, a micro-algae containing high amounts of beta-carotene (itself with high commercial value), predominates. Other organisms can also change the hue of each pond. Colors include red, green, orange and yellow, brown and blue. Finally, when the water is evaporated, the white of salt alone remains. This is harvested with machines, and the process repeats.
Date Taken on 31 October 2009, 18:58
Source 2009-10_31_BOS-SFO_398
Author Doc Searls from Santa Barbara, USA
Object location37° 28′ 50.22″ N, 122° 01′ 28.46″ W Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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This image was originally posted to Flickr by dsearls at https://flickr.com/photos/52614599@N00/4096329287. It was reviewed on 14 May 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

14 May 2020

Captions

Salt evaporation ponds in the San Francisco Bay

Items portrayed in this file

depicts

inception

31 October 2009

coordinates of depicted place

37°28'50.225"N, 122°1'28.459"W

media type

image/jpeg

checksum

8ca0a7a1ee37421fe9ceb14b7218cd533f29f26f

determination method or standard: SHA-1

data size

5,664,678 byte

height

2,336 pixel

width

3,504 pixel

exposure time

0.00625 second

focal length

38 millimetre

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Date/TimeThumbnailDimensionsUserComment
current19:15, 14 May 2020Thumbnail for version as of 19:15, 14 May 20203,504 × 2,336 (5.4 MB)EvrikTransferred from Flickr via #flickr2commons

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