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Transcript of Shields (geology)
Shields are the base of ancient mountain regions, and they are made out of Precambrian crystalline rocks. They are older than 540 million years, and radiometric age dating has shown that some Shields contain rocks that are as old as 2 to 3 billion years. In a Shield a large area of rocks from the dawn of the continent's are visible at the surface. Shields are on every continent in the world. Shields are often surrounded by platforms covered by sediment. One of the most known Shield is the Canadian Shield, therefor we are going to focus on the Canadian Shield.
Economy and Natural Resources
Shields are a rich source of minerals, because of the way they were made. Most Shields in the world have mines in them. The Canadian Shield mines a variety of things, such as gold, silver, nickel, cobalt, zinc, copper, iron ore, and even diamonds. An other natural resource is lumber. The Canadian Shield is covered with vast amounts of trees, which logging industry's use to make products such as paper. Water is also a major resource, since 1/3 of the Canadian Shield is covered with water. Over 60% of the energy we use is hydroelectric energy. Most of the hydroelectric energy is produced in the Canadian Shield.
Canadian Shield info
A Short Video
This video is about the Canadian Shield.
around the globe. It is one of the largest
Continental Shields in the world. The Canadian
The Canadian Shield is well known
Shield is about 5 million km² long, and it covers
most of the Northwest Territories, a little of northeast Alberta, northern Saskatchewan, half of Manitoba, and most of Quebec and Ontario.
The Canadian Shield also covers most of Greenland,and it covers the Adirondack Mountains
in New York, all of upper Michigan, the northern
part of lower Michigan, northern Wisconsin,
and northeastern Minnesota.
The Canadian Shield inhabits tremendous amounts of flora(plants) and fauna(animals). Some examples of plants in the Canadian Shield are trees such as white spruce, black spruce, white pine, red pine, red maple black ash and many many more. Some other types of plants are water lilies, sphagnum moss, kalmia heath. Some animals are lynx, wolf , beaver, red fox, white- tailed deer, boreal owl, bald eagle, common loon, yellow-spotted salamanders, golden shiner, and spring azure.
boreal owl wolf spring azure
Shields on every Continent
As mentioned, there are shields on every continent in the world. Here is a list of important shields on the continents:
-the Canadian Shield-located in Canada,the U.S.A, and Greenland
-The Amazonian (Brazilian) Shield-located in South America
-The Baltic (Fennoscandian) Shield-located in Norway, Finland, and Sweden
-The African (Ethiopian) Shield-located in africa
-The Australian Shield-located in Australia
-The Arabian-Nubian Shield-located at the western edge of Arabia
-The Antarctic Shield-located in Antartica
-China-Korean Shield-located in China and North Korea
-The Indian Shield-located in India