NATS 1750 Lecture Notes - Lecture 5: Outer Core, Oceanic Trench, Oceanic Crust
30 Dec 2019
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Lecture 5: the structure of earth [chapter 2] Temperature, composition, and other factors help determine earth"s layers. Core: is mainly iron-nickel (with some oxygen, sulfur, and silicon) Makes up about 55% of earth"s radius is the densest part of earth has 2 regions: the inner and outer core. Inner core: appears to be more solid, though it is extremely hot due to very high temperatures that exist in the centre of earth. The interior of the inner core is 660 degrees celsius. Some speculate that the inner core is actually crystallized iron because that can occur under the conditions in the inner core is a liquid layer produces the magnetic field through the dynamo effect. It is the behaviour of the charged particles in the outer core that regulates our magnetic field. The earth"s magnetic field varies in both strength and orientation over time. Anytime you have moving electrons, you will generate a magnetic field.
