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10 lis 2023 · An ice sheet is a mass of glacial ice more than 50,000 square kilometers (19,000 square miles). Ice sheets contain about 99% of the fresh water on Earth, and are sometimes called continental glaciers. As ice sheets extend to the coast and over the ocean, they become ice shelves.
Ice sheet, any glacier that extends in continuous sheets, moving outward in all directions, whose area exceeds more than 50,000 square km (19,000 square miles). In general, such expanses of frozen water are called ice sheets if they are the size of Antarctica or Greenland and ice caps if they are.
In glaciology, an ice sheet, also known as a continental glacier, [2] is a mass of glacial ice that covers surrounding terrain and is greater than 50,000 km 2 (19,000 sq mi). [3] The only current ice sheets are the Antarctic ice sheet and the Greenland ice sheet .
Valley glaciers flow down valleys, and continental ice sheets flow outward in all directions. Glaciers move by internal deformation of the ice, and by sliding over the rocks and sediments at the base.
29 gru 2015 · An ice sheet is a large mass of ice resting on land that is continental or subcontinental in extent, with the ice thick enough to cover most of the underlying bedrock topography. Its shape is mainly determined by the dynamics of its gravity-driven outward flow.
Scientists extract ice cores from glaciers, ice sheets, and ice caps, studying them to learn about past changes in Earth's climate. Ice sheets are made up of layers of ice that formed from snow and collected over thousands to millions of years.
24 lis 2023 · Continental glaciers (a.k.a. ice sheets) cover vast areas of land and only exist now in extreme polar regions, including Antarctica and Greenland (Figure 4.2.1). Alpine glaciers (a.k.a. valley glaciers) originate on mountains, mostly in temperate and polar regions, but even in tropical regions if the mountains are high enough.
