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Plate tectonics, erosion and glaciation
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- The Canadian Shield formed over 3 billion years through processes such as plate tectonics, erosion and glaciation. Plate tectonics refers to the movement and collision of the Earth’s outer crust. When these crustal plates collide they may weld together, forming larger landmasses.
www.thecanadianencyclopedia.ca/en/article/shield
How Was the Canadian Shield Formed? The Canadian Shield formed over 3 billion years through processes such as plate tectonics , erosion and glaciation . Plate tectonics refers to the movement and collision of the Earth’s outer crust.
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.
- The Editors of Encyclopaedia Britannica
The Canadian Shield (French: Bouclier canadien [buklje kanadjɛ̃]), also called the Laurentian Shield or the Laurentian Plateau, is a geologic shield, a large area of exposed Precambrian igneous and high-grade metamorphic rocks. It forms the North American Craton (or Laurentia), the ancient geologic core of the North American continent.
May 10, 2019 · Through the ages, winds, rain, and ice eroded the shield’s soaring mountains (some of them thousands of metres higher than present-day Everest) down to a low plateau of rolling hills. Vast quantities of sediment were deposited, layer after layer, in the shallow waters surrounding the plateau.
This Precambrian igneous rock is in a vast mass called the Canadian Shield. It was dry land ages ago when the oceans still rolled over the sites of the Appalachian and the Rocky mountains. It was uplifted to form a plateau and then carved by stream erosion. Finally glaciers scraped it almost level.
Nov 14, 2024 · The Canadian Shield is the principal area of North America where rocks of Precambrian age (i.e., those that are more than 542 million years old) are exposed at the surface. The shield was rifted apart between Canada and Greenland by seafloor spreading in the Labrador Sea and in Baffin Bay between 90 and 40 million years ago.
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The Canadian Shield is part of an ancient continent called Arctica, which was formed about 2.5 billion years ago. It was split into Greenland, Laurasia, Scotland, Siberia, East Antarctica and is now roughly situated in the Arctic around the current North Pole.
