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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. Tday it covers almost the whole of British Columbia and Southern Yukon Territory (Cordilleran Ice sheet, nUnder the force of gravity, mving masses of sand, rcks, sil, lose mud, wter and air are transported down steep slopes which are called the debris flows. Tese substances which can be anything from finely powdered rocks to mighty boulders are also pushed down glaciers and ice sheets.

Te debris casted off by glaciers is generally an unsorted heap of stones and rocks entrenched in a sandy, cayey medium and are known as till or boulder clay. Sme debris flows are slow making small internal movements of just one to two feet per year. Hwever, sme flows are very fast – travelling down with a speed of 100 miles per hour in regions with very steep slopes. Dbris flows with high speed as well as large volumes are very dangerous and are responsible number of people every year worldwide (“What is a debris flow?

Wathered materials and loose soil lack resistance power and therefore, ae easily piled and transported by wind or rain to large distances. Tere are various agents of erosion – rain, rnning water, gavity, gaciers and wind. Tese 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. Tis is the reason we find to only a few meters thick or less in nearly all parts of the world (Thompson & Turk, 2005, pThe Fraser river starts flowing from near mount robs ton situated in the western slope of the Rocky Mountains in central British Columbia, tavels southwest before joining in the Pacific Ocean.

I covers an area of 1400 kms and is sustained by a 220000 kms large drainage area. Faser River is the longest river of British Columbia. I discharges 112 cubic kilometers of water along with 20 million tons sediment into Pacific Ocean each year.

Te Fraser river basin which includes the river, sreams and its estuary are one of the most productive regions on earth. Mreover, tey provide shelter to abundance of fishes and wildlife and are responsible for almost 80% of economic production of British Columbia. Hwever, ubanization, idustrial 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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