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There are lots of accepted theories for the extinction of dinosaurs. Trouble
is there're not all accepted by the same people. Each is plausible, but
flawed, and no one theory fits all of the evidence.
1) Meteorite/Asteroid/Bolide impact: Hit in Mexico, threw up huge cloud of
dust, which blocked out the sun, earth got cold, dinos died. I personally
don't like this much, but a lot of really smart people think it's the
answer. Seems to be the current favourite.
2) Deccan Traps volcanic eruption: Huge volcanic eruption in India, threw
up dust , blocked the sun etc.....Many people's second favourite.
3) Destruction of Pangea. For much of the Mesozoic, the continents were
locked together in a supercontinent, at round about dino extinction time, it
broke up, causing massive climate shifts etc. Making the world a difficult
place to live in. I favour this one.
4) Changes in patterns of flora and fauna that were around at the time.
Diet changes, dinos can't adapt, etc..
5) Lots of others, that various people think are the most important.
Dinosaur extinction is one of the most interesting parts of dinosaur study
(IMO), but a problem with it is that many people have deeply entrenched
views, so it can become more like a religious debate than a scientific one.
In my opinion, these still solve little or nothing.
1) Dinos froze to death. Why didn't the crocodiles? They are to big to hide
and they do (as far as I know) not hibernate. They are extremely
temperature dependent (pardon my spelling), and only get female offspring
in cold weather. If they managed to survive at the time because they found
a way out, why have thy lost that ability?
2)Same problem, besides I sincerely doubt that vulcanoes errupting was a
new thing in the K/T period.
3)Memory might serve me wrong, but I thought that pangea only was a
jurassic phenomenon. However, it explains that some areas got cold, but
others must have remained warm, ad why did they die?
4) Changes always happen. I doubt that no dino could adapt.
Sad about that religous part. I think many people forget that we do not
deal with absolute facts here. Sounds like Thomas Kuhn has got a point...