Silicon Valley or Sodium Valley?

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This is a satellite view of Silicon Valley, actually it is the salt evaporation basins in the Fremont area, on the shoreline of San Francisco Bay.

I like the green ponds, they seem to be brushed in.

If you click on the "View Larger" you will see a splash of lime green, look carefully and you will see that part of the image was taken at a different time, half that pond is white.

If you soom out you will see a different set of images, here you can see the ponds are flooded with bay water, and the salt coloration is not as vivid.

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I wonder if there is a Google Earth chronological view, where you can go back in time.