Apocalypse prepping for dummies
An asteroid could hit the earth, a super volcano could erupt, a nuclear war could start, or a pandemic could kill off most of the human race. These are just some of the ways that the world could end.
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Asteroid impacts are actually not that rare. In fact, there is an asteroid that has a one in 300 chance of hitting the earth in 2029. However, it is not large enough to cause an extinction level event. A much larger asteroid hitting the earth would be required for that.