This Paper Talks About The Types Of Glaciers, Why Glaciers Are Dangerous, Where Glaciers Exist And Much More!

1352 words - 5 pages

GLACIERS!In many of the world's high mountains, the heat of the summer is not enough to melt all the snow that falls in winter. Whenever this occurs year after year, there is a gradual accumulation of snow in the upper ends of mountain valleys. These areas where the snow lasts from year to year are known as snowfields. In the sunny days of summer the surface of a snowfield melts, and the water, sinking into the snow, freezes beneath the surface and helps change the snow to ice. The weight of the snow above also compacts the snow below. The melting and refreezing of the water and by pressure change the larger part of the snow of a snowfield changed into ice. These layers of snow and ice become glaciers when they begin to flow. The great thickness of a glacier causes it to move. The many layers of ice slide past each other and act as if they were on a slant. As they melt they may create small lakes and ponds if the water has nowhere to go.A glacier is a layered body of ice, consisting mainly of recrystallized snow that moves. They creep down hills and flow through valleys. Or crawls slowly to the sea over cold nearly flat lands.TypesThere are four kinds of glaciers. The most numerous and perhaps the most familiar are cirque glaciers. They frequently occupy duep steep-walled recesses or hollows that are situated high on the side of a mountain. The very small glaciers that occupy cirques are also commonly referred to as glacierets, niche glaciers, or corrie glaciers. In the coterminous United States there are about 950 cirque glaciers. There are about 1,500 in the European Alps. The largest glaciers are called ice caps. Huge ice caps cover nearly all of Greenland and Antarctica.When the snow and ice become very duep, the ice begins to travel down the slope. Ice that has this slow creeping movement down a mountain valley from a snowfield above is called a valley glacier. Glaciers are most common in high mountain ranges, they number about 50 in the Rocky Mountains of the Western United States, for example, but are more frequent in the Alps of Southern Europe.A piedmont glacier is a thick continuous sheet of ice, resting on land, at the base of a mountain range. The spreading and joining of valley glaciers from higher elevations in the mountains form these glaciers, also called expanded-foot glaciers.An ice sheet is a broad glacier of irregular shape that blankets a large land surface. Ice sheets are of considerable thickness and more than 19,300 square miles in area. When they spread outward in all directions and are not confined by the underlying surface, they are called continental glaciers. These ice mantles are now confined to Polar Regions.The valley glaciers move slowly, but with tremendous force, and carry along masses of rock that act as cutting tools. With these tools and the ice itself, the glacier deepens the original valley floor and shears off and widens its sides. The valley that remains after the glacier has retreated is U-shaped. A...

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