How Did The Dinosaurs Become Extinct

HOW DID THE DINOSAURS BECOME EXTINCT?
How did the dinosaurs become extinct? This is a question that has stumped scientists ever since dinosaur fossils were first discovered. There are many theoriesas to how the dinosaurs became extinct. This page presents some of the most popular theories. Keep in mind that there is no absolutely proven theory. No one knows for certain exactly why and how thedinosaurs became extinct.
Probably the most popular theory right now is the Asteroid Theory. According to this theory a large asteroid or comet 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 dramatic changes in climate that resulted fromthis huge collision were too much for the dinosaurs. They were not able to survive.
Another theory that could explain how the dinosaurs became extinct is volcanic activity. A huge increase involcanic activity at around 65 million 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 dinosaurswould not be able live under such conditions and that is how the dinosaurs became extinct.
It has also been suggested that disease killed off the dinosaurs. A very deadly and contagious disease mayhave circulated among the dinosaurs forcing them to become extinct.
Still yet another theory is that the Earth just gradually changed in climate over a long time period and the dinosaurs were not ableto adapt to the cooler, dryer climate.
There are probably other theories as to how the dinosaurs became extinct. One thing is for certain. All dinosaurs that we know of are extinct. How did all the...