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The scientific agency of the United States Department of the Interior, USGS's mission is to provide information to describe and understand the earth, its natural resources, and the natural hazards that threaten it.
Fine-grained, silt-size sediment formed by the mechanical erosion of bedrock at the base and sides of a glacier by moving ice. When it enters a stream, it turns the stream's color brown, gray, iridescent blue-green, or milky white. Also called Glacier Flour or Glacier Milk.
Industry:Water bodies
An elongated ridge of glacial sediment sculpted by ice moving over the bed of a glacier. Generally, the down-glacier end is oval or rounded and the up-glacier end tapers. The shape is often compared to an inverted, blunt-ended canoe. Although not common in Alaska, drumlins cover parts of the Eastern and Midwestern United States (Irish).
Industry:Water bodies
The most recent interval of temperate glacier expansion and advance on Earth. It began ~650 years ago and continued into the 20th century in many locations. Temperate glaciers in North America, South America, Africa, Europe, and Asia were affected.
Industry:Water bodies
Disarticulation is the process through which large blocks of ice, sometimes greater than .5 miles in width, detach from the thinning and retreating terminus of a glacier that ends in a body of water. Disarticulation occurs as the terminus thins to where its buoyancy no longer permits it to remain in contact with its bed. As the glacier begins to float free and rises off the bottom it rapidly comes apart along old fracture scars and crevasses. For example, at Bering Glacier, in the Chugach Mountains, Alaska, a single observed disarticulation event resulted in nearly 2/3 of a mile of terminus retreat in a single day. As many as 100 discrete, tabular pieces of glacier ice have been observed separating from the glacier's terminus in a single event. Bering Glacier flows through Wrangell-St. Elias National Park, Alaska.
Industry:Water bodies
A stream that is characterized by a complex network of branches that continuously separate and reunite. Streams braid when they have a much greater sediment load than they can carry.
Industry:Water bodies
A narrow, tubular chute or crevasse through which water enters a glacier from the surface. Occasionally, the lower end of a moulin may be exposed in the face of a glacier or at the edge of a stagnant block of ice.
Industry:Water bodies
A measure of the change in mass of a glacier at a certain point for a specific period of time. The balance between accumulation and ablation.
Industry:Water bodies
Ozek, cevasti žleba ali crevasse skozi vode vstopi ledenjak od površine. Včasih spodnjem koncu a moulin lahko izpostavljeni v obraz ledenjak ali na robu stagnirajoče blok ledu.
Industry:Water bodies
A cross-valley, ridge-like accumulation of glacial sediment that forms at the farthest point reached by the terminus of an advancing glacier.
Industry:Water bodies
Rynny wąskie, rurowe lub wydobyty poprzez które wody wejścia Lodowiec od powierzchni. Czasami dolnego końca moulin może być narażony w obliczu Lodowiec lub przy krawędzi bloku stagnacja lodu.
Industry:Water bodies
