- 업종: 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 glacier that originates high on the wall of a glacier valley and descends only part of the way to the surface of the main glacier. Avalanching and icefalls are the mechanisms for ice and snow transfer to the valley floor below.
Industry:Water bodies
A glacier with a terminus that ends in a body of water (river, lake, ocean) into which it calves icebergs.
Industry:Water bodies
A small glacier that forms within a cirque basin, generally high on the side of a mountain.
Industry:Water bodies
A dome-shaped accumulation of glacier ice and perennial snow that completely covers a mountainous area or island, so that no peaks or Nunataks poke through.
Industry:Water bodies
A continuous accumulation of snow and glacier ice that completely fills a mountain basin or covers a low-relief mountain plateau to a substantial depth. When the thickness become great enough, tongues of ice overflow the basins or plateaus as valley glaciers.
Industry:Water bodies
A fan or lobe-shaped glacier, located at the front of a mountain range. It forms when one or more valley glaciers flow from a confined valley onto a plain where it expands. The 30-mile wide Malaspina is the largest in Alaska.
Industry:Water bodies
A glacier with a thermal or temperature regime in which ice temperatures always remain below the freezing point.
Industry:Water bodies
A glacier-like landform that often heads in a cirque and consists of a valley-filling accumulation of angular rock blocks. Rock glaciers have little or no visible ice at the surface. Ice may fill the spaces between rock blocks. Some rock glaciers move, although very slowly.
Industry:Water bodies
A glacier with a or temperature-regime in which liquid water coexists with frozen water (glacier ice) during part or even all of the year.
Industry:Water bodies
A glacier with a terminus that ends in a body of water influenced by tides, such as the ocean or a large lake. Typically, tidewater glaciers calve ice to produce icebergs.
Industry:Water bodies
