See that U-shaped valley? That’s Lairig Ghru. It was carved out by a glacier, a huge river of ice, during the ice age - just like corries and other glacial features. As glaciers move downhill ...

The North Crestone Creek drainage area is an example of the U-shaped valley typical of glacial erosion, as opposed to the V-shaped valleys made by rivers. CSU researchers modeled the extent of ...