The terminus of College Glacier in the Alaska Range, and the braided meltwater stream of College Creek draining into Phelan Creek and eventually the Delta River. The debris on the glacier surface is supraglacial moraine, rock that's been carried on top of the ice as the glacier moves.

https://www.lwpetersen.com/alaska-guide/college-glacier-hiking-guide/

#alaska #hiking #glacier #glaciology #alaskarange

A glaciated peak near the head of a tributary to the Black Rapids Glacier, Eastern Alaska Range. The bergschrunds visible on the upper ridge mark where the glacier ice pulls away from the rock headwall or stagnant ice.

https://www.lwpetersen.com/alaska-information/black-rapids-glacier/

#alaska #alaskarange #glacier #mountains

A glacier table on the Black Rapids Glacier, Alaska Range. The boulder insulates the ice beneath it from melting, while the surrounding surface melts down, leaving it perched on a pedestal. Eventually, the pedestal becomes unstable, and the rock topples, and the process starts again.

In my Glaciers Gallery: https://photos.lwpetersen.com/Galleries/Alaska-Photos/Glaciers

#alaska #glacier #alaskarange #glaciology

A small icefall on a mountain glacier flowing into the Loket Tributary of the Black Rapids Glacier, Eastern Alaska Range. The crevassing where the ice flows over the steeper terrain is visible at the center; ice fractures under tension when the bed topography forces it to accelerate.

More on the Black Rapids, one of Alaska's most studied surge glaciers: https://www.lwpetersen.com/alaska-information/black-rapids-glacier/

#Alaska #glacier #alaskarange #mountains