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More precisely, their origin should be attributed to water resulting from the melting of great masses of ice and to materials transported by it. Important roles were played by both hard, medium size boulders and lighter, smaller material. In particular, sand carried at high speed by water, which in turn was subjected to very high pressure in narrow open spaces between ice and rock, acted as a very powerful abrasive. The combined presence of these processes and of the conditions that made them possible are on balance quite rare, as are the rock hole locations which can be found in the Alps. This gives the Cavaglia Glacier Garden, where many of these beautiful erosion forms can be admired, a particular significance for scientists and tourists alike».
(Luca Bonardi)
» Swiss Federal Institute of Technology Zürich |
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A beautiful and artistic rock hole, one of fifteen which can be seen in the Garden.
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