hibbso, on Aug 17 2007, 03:11 PM, said:
Probably the most popular theory right now is the Space Theory. This theory was so said that a large comet - asteroid - meteorite (or how ever you may say it) collided with Earth about 65 million years ago. Scientists think that such a large collision would throw so much dust into the air that sunlight would not be able to shine and plants and animals would die. The changes in climate that resulted from this huge collision were too much for the dinosaurs. They were not able to survive. The either suffocated to death or died from reactions.
Another theory that could explain how the dinosaurs became extinct is volcanic activity. A huge increase in volcanic activity at around 65 millions years ago could have pumped so much ash into the air that it blocked out the sun killing the dinosaurs.
Some scientists believe that there was a severe ice age. Throughout Earth's history there have been many ice ages. The last one ended about 10,000 years ago. A very severe ice age could have changed temperatures and frozen a lot of Earth's water. The dinosaurs would not be able live under such conditions and that is how the dinosaurs became extinct.
It has also been suggested that desease killed off the dinosaurs. A very deadly desease may have circulated among the dinosaurs forcing them to become extinct.
The last theory is that the Earth just gradually changed in climate over a long time period and the dinosaurs were not able to adapt to the cooler, dryer climate. Like how human are destroying the climate now. If we carry on we will kill the world from poverty or may cause an ice-age.
NB: this text was NOT copied. I have taken notes from several websites then put them together!

Pertaining to the Asteroid Theory
In order for the dust to cover the entire earth, it would have had to have been a
REALLY big meteor. But heat would still manage to exist, and this doesn't explain how the dinosaurs living in the water came to be extinct, though some claim to have seen the Lochness monster. And this also doesn't explain how the earth managed to recover from such a
REALLY big hit.
Pertaining to the Volcanic Activity Theory
Similar to the previous theory. Heat would still exist, and does not explain how the aquatic dinosaurs became extinct. Not only that, in order to shoot out that much ash there would have to be a really big volcano in the center of the United Continents (assuming all land was once one back then), and it would have to shoot constantly, ruining all land life: both plants and animals. And as we all know, when lava hardens it becomes rock, meaning it would be a bit hard for plant life to re-grow.
Pertaining to the Ice Age Theory
It would have to have fully frozen the water (which would require REALLY deep temperatures, for the ocean is salty) and not just the surface to kill off aquatic dinosaurs (and even then, they could have probably still survive), for even today's fish can survive if just the surface is frozen. Also, there is an insect (not sure of the name but saw it on T.V. before) that is capable of surviving such temperatures though being frozen solid. It defrosts itself when the winter season is over. If there were dinosaurs that could do the same thing, they would have survived. So the ice age would have to have be
more than just severe to even kill off all of the dinosaurs, for if the latest ice age was over 10,000 years ago, it is obvious that we survived it.
Pertaining to the Massive Disease Theory
In my opinion this one has a higher chance of destroying the dinosaurs than the others. But if the disease was corrosive, it may feed off of the plants, down to the roots. It would be hard for life to "restart" if such were the case. The disease would also die out, for lack of food.
Pertaining to the last mentioned Theory
Similar to the ice age one, but i doubt the aquatic dinosaurs would feel dry.

Also, aren't the skin of dinosaurs dry regardless of the climate?
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BuffaloHELP, on Aug 18 2007, 12:36 AM, said:
Could it be possible that when "God" banished Adam and Eve from the Garden of Eden, the Bible talks about putting a distance between outcasts and the Garden in the form of fire. And something relating to the burning of any trace of the Garden so that no mankind would ever be allowed to enter/find it again. This might explain both "God" theory and a natural disaster that might have extinguished exotic living life forms, thereby burring them deep into the Earth.
This "form of fire" is actually a flaming sword that floated around the entrance to the gate of the garden of Eve not permitting any sinner to enter. But there's no mention of it going against God's command and burning the whole garden down, for i highly doubt such a thing can have free will, nor is there any mention of it having free will. But your theory would explain the extinction of dinosaurs completely: God removing the dinosaurs in order to bring about the time of Human existence. Of course this theory completely ruins the theory of evolution for those who believe in it, but anything dealing with the Biblical God does so anyways.