subglacial erosion is the type of glacier that forms a u shaped valley.
subglacial erosion is the type of glacier that forms a u shaped valley.
what type of glacier forms a u shaped valley?
subglacial erosion
u-shaped valley









































u-shaped valleys, trough valleys or glacial troughs, are formed by the process of glaciation. they are characteristic of mountain glaciation in particular. they have a characteristic u shape, with steep, straight sides and a flat or rounded bottom (by contrast, valleys carved by rivers tend to be v-shaped in cross-section). glaciated valleys are formed when a glacier travels across and down a slope, carving the valley by the action of scouring. when the ice recedes or thaws, the valley remains, often littered with small boulders that were transported within the ice, called glacial till or glacial erratic.
u-shaped valley
formation of a u-shaped valley happens over geologic time, meaning not during a human's lifespan. it can take anywhere between 10,000 and 100,000 years for a v-shaped valley to be carved into a u-shaped valley. these valleys can be several thousand feet deep and tens of miles long. glaciers will spread out evenly in open areas, but tend to carve deep into the ground when confined to a valley. ice thickness is a major contributing factor to valley depth and carving rates. as a glacier moves downhill through a valley, usually with a stream running through it, the shape of the valley is transformed. as the ice melts and retreats, the valley is left with very steep sides and a wide, flat floor. this parabolic shape is caused by glacial erosion removing the contact surfaces with greatest resistance to flow, and the resulting section minimises friction. there are two main variations of this u-shape. the first is called the rocky mountain model and it is attributed to alpine glacial valleys, showing an overall deepening effect on the valley. the second variation is referred to as the patagonia-antarctica model, attributed to continental ice sheets and displaying an overall widening effect on its surroundings.
u-shaped valley