The intense erosive action of a glacier produces vast volumes of sediments. Very fine material, called rock flour, is produced by the scraping and grinding of rock surfaces, whilst larger particles are produced by plucking and freeze-thaw. Massive rocks that fell from the valley walls onto the moving ice can also be transported, and then deposited hundreds of miles from their origins.
Geographers classify glacial sediment according to it's mode of deposition.
The collective name for all the sediments and debris deposited under glacial conditions is Glacial Drift . Sediments that were deposited by melting ice or by glacial streams are called Fluvio-glacial . Debris deposited directly by the glacier, such as moraine and intra-glacial material dropped 'in situ' by retreating ice, is known as Till The range of sediment sizes and processes of deposition produce a wide range of landforms. Once you understand each feature, make brief notes on each, explaining its origins and appearance. To test your knowledge of depositional features, answer the following questions as if you were in an examination.