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Earth & Ecology Essay Example

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Earth & Ecology

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The Cordilleran ice sheet covered up to two and a half million square kilometers at the Last Glacial Maximum and perhaps more than that in some preceding phases. Today it covers almost the whole of British Columbia and Southern Yukon Territory (Cordilleran Ice sheet, n.Under the force of gravity, moving masses of sand, rocks, soil, loose mud, water and air are transported down steep slopes which are called the debris flows. These substances which can be anything from finely powdered rocks to mighty boulders are also pushed down by melting glaciers and ice sheets. The debris casted off by glaciers is generally an unsorted heap of stones and rocks entrenched in a sandy, clayey medium and are known as till or boulder clay. Some debris flows are slow making small internal movements of just one to two feet per year. However, some flows are very fast – travelling down with a speed of 100 miles per hour in regions with very steep slopes. Debris flows with high speed as well as large volumes are very dangerous and are responsible for killing number of people every year worldwide (“What is a debris flow?Weathered materials and loose soil lack resistance power and therefore, are easily piled and transported by wind or rain to large distances. There are various agents of erosion – rain, running water, gravity, glaciers and wind. These agents carry weathered materials over long distances before finally dumping them as layers of sediments on earth’s surface. Soil is removed as fast as it is formed when all these eroding agents work together. This is the reason we find soil to be only a few meters thick or less in nearly all parts of the world (Thompson & Turk, 2005, p.The Fraser river starts flowing from near mount robs ton situated in the western slope of the Rocky Mountains in central British Columbia, travels southwest before joining in the Pacific Ocean. It covers an area of 1400 kms and is sustained by a 220000 kms large drainage area. Fraser River is the longest river of British Columbia. It discharges 112 cubic kilometers of water along with 20 million tons of sediment into the Pacific Ocean each year. The Fraser river basin which includes the river, streams and its estuary are one of the most productive regions on earth. Moreover, they provide shelter to abundance of fishes and wildlife and are responsible for almost 80% of economic production of British Columbia. However, urbanization, industrial development and increasing stipulation for

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preview essay on Earth & Ecology
  • Pages: 7 (1750 words)
  • Document Type: Essay
  • Subject: Physics
  • Level: Undergraduate
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