Earth’s Magnetism

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Learn the cause, properties and effects of Earth's magnetic field.

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Earth’s Magnetism

  1. 1. Earth’s Magnetism Mr. Bradford
  2. 2. Magnetic Basics <ul><li>Magnets always have two poles: a north pole and a south pole. </li></ul><ul><li>North and South are always attracted. </li></ul><ul><li>Two similar poles will repel one another. </li></ul>
  3. 3. Earth as a Magnet <ul><li>The Earth is like a giant bar magnet—it has a north magnetic pole and a south magnetic pole. </li></ul><ul><li>These are different than the geographic north and south poles. </li></ul><ul><li>The magnetic poles move a little (10 km) each year. </li></ul>
  4. 4. Why is Earth Magnetic? <ul><li>Earth’s core is iron, a magnetic material </li></ul><ul><li>Earth’s outer core is liquid iron. </li></ul><ul><li>When this liquid </li></ul><ul><li>iron circulates </li></ul><ul><li>around the </li></ul><ul><li>core, a magnetic </li></ul><ul><li>field is </li></ul><ul><li>developed. </li></ul><ul><li>This is known </li></ul><ul><li>as the Dynamo </li></ul><ul><li>Theory </li></ul>
  5. 5. What Benefit is a Magnetic Field? <ul><li>The Earth’s magnetic field protects us from the sun’s charged particles. </li></ul><ul><li>The magnetic field acts like a force field—without it, our atmosphere would be ripped off. </li></ul>
  6. 6. Northern and Southern Lights <ul><li>The Earth’s magnetic field is the reason we have Aurora Borealis and Aurora Australis (northern and southern lights). </li></ul><ul><li>These are caused by charged particles from the sun that get trapped in Earth’s magnetic field and get directed towards the northern and southern ends of the Earth. </li></ul><ul><li>The charged particles, when they reach our atmosphere will interact with the elements (Nitrogen, Oxygen, etc.) and give off lights that dance and swirl in the sky. </li></ul>

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