Homework Assignment Example | Topics and Well Written Essays - 1750 words

Homework - Assignment Example The scientific method of geologists is to collect information, observe it , try a lot of different assumptions, read and discuss other peoples papers and grope their way toward greater certainty, or at least figure the answers with the best odds. The Canadian shield, is a vast stretch of land covering the North America covered with thin layer of soil. It is also known as the Laurentian plateau. It is a collage of structural provinces composed of igneous rocks which are of volcanic origin. The areas covered in the shield have a deep, common, joined bedrock region in Eastern and Central Canada and in the North covering Great Lakes to the Arctic Ocean, and in the South covering part of USA. The Shield is one of the worlds richest areas in terms of  mineral  ores. It is filled with substantial deposits of  nickel,  gold,  silver, and  copper. Throughout the Shield there are many mining towns extracting these minerals. The Canadian Shield is a mosaic of structural provinces, each with characteristic internal structural trends and styles of folding. Volcanic eruptions and the movement of lava on the region lead to formation of folding on the surface. The Earths internal heat source provides the energy for our dynamic planet, supplying it with the driving force for plate-tectonic motion, and for on-going catastrophic events such as earthquakes and volcanic eruptions. This internal heat energy was much greater in the early stages of the Earth than it is today, having accumulated rapidly by heat conversion associated with three separate processes, all of which were most intense during the first few hundred thousand years of the Earths history: (1) extraterrestrial impacts, (2) gravitational contraction of the Earths interior, and (3) the radioactive decay of unstable isotopes. It is a theory that states that the Earth’s crust has been formed as a result of some worldwide occurring disaster, by some sudden, short-lived and violent sequence