Louis Agassiz and movement of glaciers

Professor Iain Stewart visits the Mortarach glacier in the Swiss Alps. Here, geologist Louis Agassiz gathered evidence in the 1830s to prove that glaciers moved downhill. Prof Stewart re-creates Agassiz's experiment and then shows modern evidence of movement using web-cam images. Stewart is lowered into a crevasse to show the scale of a glacier, then goes into an ice cave to examine boulders embedded in the glacial ice.

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