Rift Escarpments, Eritrea

Photograph by Chris Johns

A mosque dominates the farming villages of Adi Caieh, Eritrea. Rift escarpments in the distance, now heavily eroded, once adjoined the Arabian Peninsula before the Red Sea opened. The escarpments shifted when the continental crust moved west, as the Red Sea formed in stop-start action during a 30-million-year period.

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