(Source: forages, via geologyrocks)
(Source: nationalgeographicscans)
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Posts tagged "national geographic"
Posts tagged "national geographic"
"We have an unknown distance yet to run, an unknown river to explore. What falls there are, we know not; what rocks beset the channel, we know not; what walls ride over the river, we know not. Ah, well! we may conjecture many things." John Wesley Powell
