- 産業: Government
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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.
A moraine ridge consisting of a drape of sediment overlying a mass of stagnant ice.
Industry:Water bodies
Multiple, generally parallel, linear grooves, carved by rocks frozen in the bed of a glacier into the bedrock over which it flows.
Industry:Water bodies
A cone or mound of debris-covered ice, with a thick enough sediment cover to protect the ice from melting.
Industry:Water bodies
Any curved mark or fracture produced by plucking or chipping of the glacier's bed. Larger than chatter marks, typically the horns of these gouges point up glacier.
Industry:Water bodies
A block of ice that has broken or calved from the face of a glacier and is floating in a body of marine of fresh water. Alaskan icebergs rarely exceed 500 feet in maximum dimension. In order of increasing size, the following names are used: brash ice, growler, bergy bit.
Industry:Water bodies
A tongue of glacier ice that flows away from the main trunk of the glacier. This may result from differential melting changing the gradient of part of a glacier.
Industry:Water bodies
Several landslides generated by the Great Alaskan Earthquake, Good Friday 1964, fell onto the surface of the so-named glacier in the Chugach Mountains, Alaska.
Industry:Water bodies
The thinning of a glacier due to the melting of ice. This loss of thickness may occur in both moving and stagnant ice. Also called Thinning.
Industry:Water bodies
Fluctuations in the worldwide sea-level regime caused by changes in the quantity of seawater available. The greatest changes are caused by water being added to, or removed from, glaciers.
Industry:Water bodies
A depression that forms in an outwash plain or other glacial deposit by the melting of an in-situ block of glacier ice that was separated from the retreating glacier-margin and subsequently buried by glacier sedimentation. As the buried ice melts, the depression enlarges.
Industry:Water bodies
