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The Core

The Core. By Kevin Fuquay And Hunter Smith Period 5. The Core. Discovered by Seismologist Inge Lehmann when certain earthquake waves passed through and others didn’t. Divided into 2 parts: Inner Core and Outer Core. The source of the Earth’s magnetic field. Rotates faster then the Earth.

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The Core

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  1. The Core By Kevin Fuquay And Hunter Smith Period 5

  2. The Core • Discovered by Seismologist Inge Lehmann when certain earthquake waves passed through and others didn’t. • Divided into 2 parts: Inner Core and Outer Core. • The source of the Earth’s magnetic field. • Rotates faster then the Earth. • 15% of the volume of Earth.

  3. Inner Core • 3160-3954 miles deep. • Radius is 758 miles (70% the size of the moon.) • Believed to be made of iron-nickel alloy. • Temperature is believed to be 9800 degrees Fahrenheit. • Slowly cooling: about 100 degrees Celsius every billion years.

  4. Outer Core • About 1790-3160 miles deep. • Liquid Core made of iron and nickel. • Currents in the outer core believed to cause the magnetic field. • Not under enough pressure to be solid. • Temperature believed to be 7200-9032 degrees Fahrenheit.

  5. Magnetic Field • Caused by the presence of the core. • Protects Earth from solar winds, creates protective shield around Earth. • Without the magnetic field, Earth would be like Mars (the solar wind would destroy the atmosphere) . • An example of a magnetic dipole (closed circulation of electric current.) • North and South poles.

  6. Earths Other Layers • Crust is the outermost layer, thin (about 1% of Earth’s volume) , made of sedimentary, igneous and metamorphic rock. • Plate Tectonics sit on the crust. • Mantle is largest part of earth (84%). • Solid, made of rocks like peridotite, dunite and eclogite . • Temperature is 932-1652 degrees Fahrenheit.

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