Glacier movement refers to the slow flow of ice within a glacier due to gravity and the pressure of overlying ice. This movement occurs in two main ways: internal deformation, where ice crystals change shape and slide past each other, and basal sliding, where the glacier slides over the ground due to meltwater acting as a lubricant. As glaciers move, they can shape the landscape by eroding rock and soil, creating features like U-shaped valleys and moraines. The rate of movement can vary based on factors such as temperature, slope, and the amount of meltwater present.