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The glacier is actually moving like a river under the effect of its own weight, traveling 90 meters every year (1cm every hour). The seasonal effects of melting and snowing translate into dark and white stripes on the glacier, such that the time it takes to move from the top of the mountain to the valley can be calculated by counting the number of stripes. Although in 1900 the glacier reached the valley of Chamonix, it has now melted and it now stops before reaching the valley.