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The relief forms are determined by the composition and lithological structure, and by the processes that led to its genesis. The photograph above is one of the best maps of the earth's crust ever made of the planet we live in.
The map incorporates data provided by several different countries around the world. The continental crust is found in the emerging areas of the planet, but also under the oceans, near the coasts. It is formed by plutonic, volcanic, sedimentary and metamorphic rocks. It is thicker and less dense than oceanic. In it are the oldest rocks.
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