Moraine refers to any glacially formed accumulation of unconsolidated debris which can occur in currently glaciated and formerly glaciated regions, such as those areas acted upon by a past
ice age. This debris may have been
plucked off the valley floor as a
glacier advanced or fallen off the valley walls as a result of
frost wedging. Moraines may be composed of silt like
glacial flour to large boulders. The debris is typically angular. Moraines may be on the glacier’s surface or deposited as piles or sheets of debris where the glacier has melted. Moraines may also occur when glacier or
iceberg transported rocks fall into the sea as the ice melts.
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