Why did the dinosaurs become extinct?

Answer

There is not sufficient proof as to why dinosaurs went extinct, but experts believe it is related to geological events, diseases, climate change and lack of plant life for sustenance. The last known dinosaurs, according to their fossils, existed about 65 million years ago.

Over the years, there have been many theories and speculations about why dinosaurs went extinct. As more fossils are attained and technology allows science to advance further, palaeontologists have new theories. A persistent theory is that the sunlight was blocked by a large meteorite that crashed into the Earth. Without the sun, plants were unable to grow, and plant-eating dinosaurs would have died without a proper food source. Without herbivore dinosaurs, the carnivore dinosaurs also lose their food source.

Q&A Related to "Why did the dinosaurs become extinct?"
Scientist are still trying to learn why dinosaurs are extinct. Many believe that an asteroid or other natural occurance happened causing a change in climate that killed the dinosaurs
http://www.ask.com/web-answers/Science/Nature/why_...
Nobody knows but scientist guess that the asteroid hit the Earth and it killed all the dinosaur
http://wiki.answers.com/Q/Why+did+the+dinosaurs+be...
How did dinosaurs become extinct? Why aren't dinosaurs roaming the Earth with us today? No one really knows the answer to these questions, but you can explain the theories currently
http://www.life123.com/parenting/education/dinosau...
At Dinosaur National Monument only Morrison rocks of the upper Jurassic Period contain the fossil bones of dinosaurs. After Morrison time, the Cretaceous seas invaded this area. More
http://www.nps.gov/history/history/online_books/na...
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