Multiple choice general knowledge

Why are Earths magnetic fields considered as a Doomsday issue?

  1. They swap themselves causing widespread damage

  2. They switch off every few years

  3. They run out of battery and need to be recharged

  4. Nothing can happen to them, we have a lifetime warranty for them anyway
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Earth's magnetic poles reverse polarity approximately every 200,000-300,000 years (north becomes south and vice versa). During these reversals, the magnetic field weakens significantly, which could leave Earth vulnerable to increased solar radiation and cosmic rays that typically get deflected. This could damage satellites, power grids, and electronic infrastructure - hence the doomsday concern.

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