Answer :

The single word used to describe the unsorted and unstratified sediment deposited directly by ice is till.

Till refers to a type of glacial drift which is the rock material carried away by a glacier and directly deposited from the ice or running water from the ice. It is different from other types of drift in way that it is deposited directly by glaciers without being reworked by meltwater. Till is characterized by unsorted and unstratified sediment of glacial deposits which is not generally consolidated. Till is formed due to the erosion and entrainment of rock material caused by the moving ice of a glacier. It is deposited at some distance down the ice to form terminal, lateral, medial and ground moraines. Tills are classified into primary and secondary deposits. Primary deposits are laid down directly by glaciers while secondary deposits are reworked by transport and other processes.

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