What causes glaciers to move?

Glaciers move due to the force of gravity and the deformation of ice under pressure. As snow accumulates at higher elevations, it compresses into dense ice. The weight of the ice causes it to flow downhill, either as a solid mass or through basal sliding, where meltwater acts as a lubricant between the glacier and the ground. Glacial movement reshapes landscapes by carving valleys, transporting debris, and depositing sediments in their path.