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The Canadian Shield refers to the exposed portion of the continental crust underlying the majority of North America. The crust, also known as the North American Craton, extends from northern Mexico to Greenland and consists of hard rocks at least 1 billion years old. With the exception of the Canadian Shield, the rocks of the North American ...
Jul 6, 2021 · The mountains of the Canadian Shield were eroded. Erosion happens when wind and rain wear down rocks, land, and earth. The Canadian Shield continues to be changed by environmental forces every day. Physical Features and Resources. Erosion and glaciers have made much of the Canadian Shield smooth. The Canadian Shield is not all the same though.
The Canadian Shield is a U-shaped subsection of the Laurentia craton signifying the area of greatest glacial impact (scraping down to bare rock) creating the thin soils. The age of the Canadian Shield is estimated to be 4.28 Ga. The Canadian Shield once had jagged peaks, higher than any of today's mountains, but millions of years of erosion ...
The Canadian Shield constitutes the largest mass of exposed Precambrian rock on the face of Earth. The region, as a whole, is composed of ancient crystalline rocks whose complex structure attests to a long history of uplift and depression, mountain building (orogeny), and erosion. Some of the ancient mountain ranges can still be recognized as a ...
- The Editors of Encyclopaedia Britannica
May 10, 2019 · The Canadian Shield only came into terminological being in the 1880s. Its name combines two ideas. The first was colonial politician Thomas D’Arcy McGee’s vision, articulated in 1860, of “one great nationality bound, like the shield of Achilles, by the blue rim of ocean” encompassing “the Western mountains and the crests of Eastern waves” as well as the rivers and valleys between.
The Canadian Shield was formed From tectonic plate movement and collision, when the tectonic plates collided it caused the earth's crust to deform which is called “orogeny”. Orogenies cause mountain ranges, the Canadian shield formed through multiple orogenies it was once covered in mountains. Those mountains were eroded by wind and rain.
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Born of the cataclysmic convulsions of the earth after it had solidified from a molten mass, the Canadian Shield dates back at least 21/2 billion years. It has since been wrung by contractions of the earth’s crust, jolted by subterranean upheavals, crushed and clawed by Ice Ages, and eroded by the weather of countless centuries.
