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Earth's magnetic field is caused by movements in its core. Its outer core is roughly $2,890,000 \text{ meters}$ below Earth's surface. Therefore, to directly interfere with Earth's magnetic field, ...
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#1: Attribution notice removed
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2020-06-01T14:13:41Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/7194 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/