Glaciers shape landscapes through various processes such as erosion, transportation, and deposition. When glaciers move, they pick up rocks and debris, which erode the land beneath them. As they advance, glaciers carve out valleys, create U-shaped valleys, and form deep basins known as cirques. The debris carried by glaciers can also create moraines, drumlins, and other landforms when deposited. Ultimately, the movement and melting of glaciers have a significant impact on shaping the Earth's surface over time.