Magnetic field: an introduction

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An introduction to Earth's magnetic field: what it is, where it comes from and what it's used for.

This is the first of three videos:
Magnetic field: an introduction
Magnetic field: why it matters: http://youtu.be/6vYzVdSxjUs
Magnetic field: learning more with Swarm http://youtu.be/Wn-BV9Zp8Pk

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