POL 307- Final Exam Guide - Comprehensive Notes for the exam ( 37 pages long!)
29 Mar 2018
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The outer layer of the earth is mostly made of two types of rock. (although there are often other rocks on top of these) The kola superdeep borehole, goes down 12,262 m (about 7. 6 miles). By comparison, the thinnest continental crust on earth is around 10-15 miles thick. In some places, volcanic or tectonic processes may bring rocks from deep in the. These rocks have been greatly altered by their journey, so we don"t know exactly what they were originally. However, they are certainly rock-like materials (probably pyroxenes and olivines). In 1798, henry cavendish weighed the earth. (it weighs 6 1024 kg). If the earth is just made of stone-like materials, it should be much lighter than it actually is. So there must be something heavier than rocks inside the earth. Around 4. 6 billion years ago, the solar system forms from a huge rotating cloud of dust and gas by accretion.
