EESA10H3 Lecture Notes - Lecture 2: Kola Superdeep Borehole, Continental Crust, Oceanic Crust
7 Feb 2020
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Document Summary
The earth formed from the coalescence of interstellar dust and asteroids about 4. 6 bya. As the earth cooled, heavy elements tended to collect towards the center, while lighter elements arose. Over time, this process created layers with different chemical compositions and mechanical properties. The earth is differentiated into layers based both on its mechanical properties (liquid vs solid vs plastic) and its chemical or compositional properties. The earth crust is defined based on its composition and refers to the relatively silica-rich low-density rocks that form the thin outer rind of the earth. There are two types of crust with slightly different compositions and densities. The crust, together with the rigid uppermost layer of the mantle makes up the. Geology is primarily concerned with studying rocks exposed at or near the surface. Some geologists work in the field and travel all over the world in order to describe and map rocks.
