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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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Glacial Lake in cirque, Montana

Hidden Lake occupies a glacial cirque in Glacier National Park, Montana. Reynolds Mtn in background is a glacial horn. Bedrock is Proterozoic rock of the Belt Supergroup. (30-9566)
Download ImageSoil in subalpine forest, Montana

Soil developed on Cretaceous sandstone in subalpine forest, Montana. (30-9607)
Download ImageAngular unconformity, Olympic Coast, WA

Angular unconformity between Pleistocene beach gravels and tilted and overturned turbidites of Hoh accretion assemblage, Olympic National Park, Washington (30-6249)
Download ImageIntrusive rock varieties in facing stone

Intrusive rock varieties in facing stone. Granitic rocks on top; gabbro on bottom. (30-9121
Download ImageGlacial Lake, N Montana (vertical)

Hidden Lake occupies a glacial cirque in Glacier National Park, Montana. Reynolds Mtn in background is a glacial horn. Bedrock is Proterozoic sedimentary rock of the Belt Supergroup. (30-9534)
Download ImageGlacial Lake in cirque, Montana

Hidden Lake occupies a glacial cirque in Glacier National Park, Montana. Reynolds Mtn in background is a glacial horn. Bedrock is Proterozoic sedimentary rock of the Belt Supergroup. (30-9535)
Download ImageGlacial Lake in cirque, Montana

Hidden Lake occupies a glacial cirque in Glacier National Park, Montana. Reynolds Mtn in background is a glacial horn. Bedrock is Proterozoic sedimentary rock of the Belt Supergroup. (30-9527)
Download ImageGlacial Lake, Northern Montana

Hidden Lake, a glacial lake in Glacier National Park, Montana. Bedrock is Proterozoic sedimentary rock of the Belt Supergroup. (30-9521)
Download ImageWillis Wall of Mt. Rainier, WA

Aerial view of Willis Wall of Mt. Rainier, Washington. (30-9241)
Download ImagePegmatite intruding granite, Colorado

Pegmatite dikes intruding granite, Colorado. (30-9000)
Download ImageIrrigation effects in desert, Arizona

Aerial view of effect of irrigation on desert, Phoenix, Arizona (30-7904)
Download ImageColumbia River Gorge, Oregon (vertical)

Columbia River Gorge, Oregon, view upriver. (30-7804)
Download ImageRice fields in central valley, California

Aerial view of rice fields in central valley, California. (30-8012)
Download ImageIrrigation effects in desert, Arizona

Aerial view of effect of irrigation on desert, Phoenix, Arizona (30-7873)
Download ImageVista House at Crown Point, Oregon

Vista House at Crown Point, Oregon and Columbia River Gorge, (30-7818)
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