The Upper Santa Cruz Valley in Peru, showing darker ridges of moraines that were left behind as the glaciers receded. (IMAGE)

Aberystwyth

The Upper Santa Cruz Valley in Peru, showing darker ridges of moraines that were left behind as the glaciers receded.

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The Upper Santa Cruz Valley in Peru, showing darker ridges of moraines that were left behind as the glaciers receded.

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Aberystwyth University

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