The Canadian Shield refers to the exposed portion of the continental crust underlying North America. The crust, also known as the North American Craton, consists of rock from the Archean and Proterozoic eons and extends from Mexico to Greenland. The Canadian portion runs from central Ontario<span> north to the </span>Arctic Archipelago, and fromLabrador<span> west to the </span>Northwest Territories<span>. The Shield includes some of the oldest rocks on Earth (possibly more than 4 billion years old). While at times a barrier to settlement, the Shield has also yielded great resources, including </span>minerals<span>, </span>coniferous forests<span> and the capacity for</span>hydroelectric<span> developments.</span>
Answer:
Olmec
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Answer:
1. hydrogen Nitrogen Lead Mercury
2. Phytoplankton
3. About 71 percent of the Earth's surface is water-covered, and the oceans hold about 96.5 percent of all Earth's water. Water also exists in the air as water vapor, in rivers and lakes, in icecaps and glaciers, in the ground as soil moisture and in aquifers, and even in you and your dog.
Explanation:
Did you know that more than half of the oxygen on earth is produced by these tiny one-celled plants in the surface of the ocean called phytoplankton?
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Radioactive isotopes (also called radioisotopes<span>) have unstable nuclei. These isotopes disintegrate to form atoms with stable nuclei by the release of subatomic particles and </span>gamma rays<span> (akin to X-rays). The radioactive elements are referred to as parents atoms; the atoms they disintegrate to form are called daughter products.
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Among the options shown here:
Due to Europeans overpowering native populations.
Explanation:
