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Transcript
The Earth’s Magnetic Field Earth is like a bar magnet The Earth’s Magnetic Field protects us from Solar Wind ►A stream of electrically charged particles that could destroy life on earth ►Interaction between solar wind and earth’s atmosphere can be seen near the north & south pole in the form of Aurorae What causes our Magnetic Field? The Dynamo Theory: ►Rotation of the earth causes liquid rock in outer core to spin ►Moving electrons from the iron & nickel creates an electric current ►Electric currents produce magnet fields (Faraday’s Law) ►To make an electromagnet: you only need flowing electrons that surround an iron core ►The magnetic field changes through time, due to changes in the flow of molten currents How do we know it changes? ►Below a certain temperature, rocks will “record” the direction of the magnetic field
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