ナショナルジオグラフィックのインスタグラム(natgeo) - 6月28日 19時44分

Photo by George Steinmetz @geosteinmetz | When pondering the explosive rise of human population, it’s useful to step back and consider it in the context of deep Earth time. The Richat Structure is a familiar landmark to astronauts passing over the Sahara, and remains something of an enigma to geologists. Originally thought to be a meteorite impact, it is now known to be a hundred-million-year-old volcanic structure that weathered away to its current form. Cosmic collisions and volcanic spasms are ticks of the planetary clock but leave enduring scars. Will our surging population do the same? To explore more of our world from above, follow @geosteinmetz.

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