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Jan 12, 2015 at 22:42 comment added Jon Story That depends how big it is, how much dust it throws up etc. a massive one would be instant, but it can be small enough that the shockwaves doesn't kill everyone, but still throw enough dust into the atmosphere to block the sun. So it would take a while for the plants to die from lack of sunlight, followed by the animals...then we've got a period of killing each other for the last of the tinned food before we die too.
Jan 12, 2015 at 22:02 comment added Monica Cellio How long do mass-extinction events take to cause the mass extinctions? If a giant asteroid slams into earth today, will anybody still be here next month?
Jan 12, 2015 at 15:54 comment added Jon Story It provides an answer to the spirit of the problem provided, if not the precise wording of the question.....
Jan 12, 2015 at 14:06 review Low quality posts
Jan 12, 2015 at 16:30
Jan 12, 2015 at 14:01 comment added Tim B The problem with an impact is that after a few years things start to return to normal.
Jan 12, 2015 at 13:51 review First posts
Jan 12, 2015 at 13:57
Jan 12, 2015 at 13:48 history answered Jon Story CC BY-SA 3.0