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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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Cambrian Flathead Sandstone overlying Proterozoic gneiss in Southwest Montana. Note the pegmatite dike in the gneiss and the basal conglomerate in the sandstone. A nonconformity is a type of unconformity in which sedimentary rock depositionally overlies intrusive igneous or metamorphic rock. (Image ID# 100629-37)Download Image
Paleozoic Rock of the Resting Spring Range as seen from the Amargosa Valley. The red-brown colored strata near the base of the photo belong to the Cambrian Cararra Formation while the overlying gray limestone belongs to the Cambrian Bonanza King Formation. (Image ID# 101218-38)Download Image