Final answer:
The materials deposited by ice are till and moraines, which are indications of past glacial activity and include unsorted sediments such as clay, sand, and rocks.
Step-by-step explanation:
The key materials deposited by ice are till and moraines. Till is an unsorted mixture of sediment and rocks that is deposited directly by a melting glacier and includes a combination of different grain sizes from clay to boulders. Moraines consist of till that has been deposited in a variety of landforms such as ridges and mounds, which form from the accumulation of debris at the edges and surface of glaciers. These deposits are essential indicators of past glacial activity on Earth and Mars.