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SOME POINTERS:
Photos typically include their locations, so you can use locations as keywords too. You get more hits with shorter words, and fewer hits as you become increasingly specific with increasing numbers of keywords. It’s best to use singular rather than plural (eg “volcano” instead of “volcanoes”).
As some words are included in others (“salt” within “basalt,” for example) you might want to be more specific to avoid getting a bunch of irrelevant photos.
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Sulfur chimneys and fumaroles

Sulfur chimneys and fumaroles in crater of White Island, an active andesite volcanic island, New Zealand. (180110-43)
Download ImageHot Springs, Fumaroles, sinter, Yellowstone NP

Hot springs, fumaroles, and hydrothermal deposits, Norris Geyser Basin, Yellowstone National Park, Wyoming. Most of the deposits are sinter. (G-10)
Download ImageActive volcanic crater, New Zealand (Pan)

Active crater with lake, White Island, an andesite volcano in the Bay of Plenty, New Zealand. Crater Walls are mostly pyroclastic deposits. (180110-145)
Download ImageActive volcanic crater, New Zealand

Active crater with lake, White Island, an andesite volcano in the Bay of Plenty, New Zealand. Crater Walls are mostly pyroclastic deposits. (180110-120)
Download Imagesulfur mineralization in volcanic crater

sulfur chimneys and fumaroles in volcanic crater of White Island, New Zealand. (180110-110)
Download Image
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