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Volcanoes of the great Rift Valley of East Africa.

Rift Valley

Volcanoes of the great Rift Valley of East Africa.

Section of the rift valley of the Rhine. 1) granite; 2-7)Mesozoic rocks; 8,9) Tertiary and recent.

Rift Valley of the Rhine

Section of the rift valley of the Rhine. 1) granite; 2-7)Mesozoic rocks; 8,9) Tertiary and recent.