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Glaciers And Glaciations

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Glaciers And Glaciations Glaciers are made up of fallen snow that, after long time, is compressed into large, thick ice masses. Glaciers form when snow remains in one location long enough to transform into ice. What makes glaciers is their ability to move. Because of their mass, glaciers flow like very slow rivers. Glaciers occupy more less the 10% of the world's total land area, and most of them are located in Polar Regions like Antarctica and Greenland. Glaciers are residues of the Ice Age, when ice nearly covered the 32% of the land, and 30% of the oceans. An Ice Age can occur if cool temperatures are constants for long periods of time, allowing polar ice to advance into lower latitudes. Within the past 750,000 years, scientists realized that there have been at least eight Ice Age cycles, separated by warm periods (interglacial periods). Currently, the Earth is reaching the end of an interglacial period, so this means that in a few thousand years there will be another ice age. This is part of the normal climate variation cycle. ...read more.


This hanging glacier above Lyman Lake in Washington State may look simply like a mass of snow, but the crevasses are evidence that it really is a glacier. Glacial most common features are moraines, created when the glacier pushes or carries the rocky debris as it moves. These long, dark bands of debris are visible on top and along the edges of glaciers. Medial moraines run down the middle of a glacier, lateral moraines along the sides, and terminal moraines are found at the end (also called snout) of a glacier. Sometimes one glacier flows into another, also creating moraines. Barnard Glacier shows several medial moraines. In this case, the thickest medial moraines occur where additional glaciers flow into Barnard Glacier. Types Of Glaciers Ice Sheets They are found only in Antarctica and Greenland. Ice sheets are huge masses of glacial ice and snow expanding over 50,000 square kilometers. Ice Caps Ice caps are miniature ice sheets, covering less than 50,000 square kilometers. ...read more.


However, the experiment proved to be too expensive, so they have left the idea. In Switzerland, farmers have irrigated their crops by channeling melt water from glaciers to their fields. Glaciers Help Generate Hydroelectric Power Scientists and engineers in Norway, Canada and New Zealand have worked together to goal into glacial resources by using electricity that has been generated in part by damming glacial melt water. Are glaciers dangerous? Flooding Caused by a Glacier In Peru, in 1941, 6000 people were terrorized when a glacial lake suddenly exploded, flooding the town of Huaraz below it. Since then, another lake has formed at the base of the glacier, but engineers have created artificial channels to prevent future flooding. Avalanches from Glaciers Ice avalanches from glaciers have been recorded in the Swiss Alps. In 1965 Switzerland was constructing a dam for a hydroelectric plant above the town of Mattmark. Without warning, a huge mass of ice from the tongue of Allalingletscher broke off. In few seconds, the avalanche rushed down the slopes and buried much of the construction camp, killing 88 workers. ...read more.

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