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 ...

When Glacial Lake Missoula's ice dam shattered, a northern arm of the lake drained in a matter of hours through a narrow gap in Montana's Blackfoot River valley. One can only imagine the ...