The most common theory of why dinosaurs became extinct is indeed the one explained above. A giant meteorite struck Earth, eventually killing all vegetation, therefore the diet of dinosaurs which led to their downfall.
What do you think? I've always heard that a meteor hit the earth and the after effects gobbled up the lives of these amazing creatures. Perhaps it was some sort of horrible disease...my husband gets nervous when there are stories of scientists digging up evidence of the Jurassic and other dinosaur periods in the ice-covered regions of the world. He's convinced (from sci-fi movies, I'm sure) that they will release something that's been dormant for millions of years and we'll all be wiped out in days.
The first remains of dinosaurs have been discovered in England, by the 1820s. By 1840 there were already several known genera, which allowed to the great anatomist Richard Owen to give them the name of Dinosauria (in Greek, "terrible reptiles").
The first and most famous of these assumptions is the impact of a huge meteorite or a comet with the Earth, an event that would have been produced in that era in which it have disappeared and the dinosaurs. The place of the meteorite-impact was identified recently in the Yucatan peninsula in Mexico and is a "scar" in the form of a huge crater, with a diameter of 200 km.
The impact of this celestial body is supposed that would have been led to an enormous cloud of vapor that rising into the atmosphere and covering sky with a "curtain", thus have been stopped the sunlight to reach the ground. The result was inevitable: the vegetation on Earth has disappeared in most, which eventually led to extinction of the dinosaurs which died from starvation.
What can not explain this hypothesis is why disaster affected only dinosaurs.
dinosaurs really existed...yet,there are just few theories or studies made...in our generation today, scientists usually dig dinosaur fossils to study them and to explain how dinosaurs extincted in this world<to explain whwt are the factors why they died>....many are really curious about dinosaur`s lives so, we hope there are more studies for us to knoe what are dinosaurs really are...<to the scientists, hope you would discover more!! keep reaching!!>