Can someone Explain what Killed the Dinosaurs? Please?

Question

Dumb Question, I know. But I never get the same story. Thanks for your patience.

Answer 1

most popular theory is that a massive asteroid strike did it...

Answer 2

I guess the point is people keep coming up with different data and ideas about how to organise the data into a coherent whole.

It seems fairly certain that the climate changed quite considerably at the boundary between the Cretaceous (K) and Tertiary (T) periods and that is generally where the fossil remains of large dinosaurs disappear. The Chicxulub impact structure on the Yucatan peninsula (and in the sea next to it) appears to date from this time. A deposit with higher than normal levels of the element iridium can be found around the world near or at the K-T boundary. Meteorites may contain elevated levels of iridium.

The impact scenario says a large asteroid, maybe 10 km across, impacted the Earth, caused massive blast damage, heat, fire etc and also threw a lot of dust into the stratosphere, blocking sunlight and depressing photosynthetic activity on the Earth for many years.

Some paleontologists say that the fossil record indicates a more gradual decline than such a scenario seems to imply. Other impact structures have also been identified and associated with the K-T boundary. Some people envision something like what we saw when comet Shoemaker-Levy 9 struck Jupiter in 1994. Others point to increased volcanism acting over a much longer period.

Answer 3

One theory is that a large comet hit the Eath,throwing dust into the sky.If the dust cut out all sunlight for a while,killing most plants there would have been a worldwide famine.This might have killed the dinosaurs but allowed some smaller animalssuch as the ancestor of mammals,to suvive by scavenging on dinosaur carcasses.Another theory is that the dinosaursdied out graduallydue to changes in the climate.

Answer 4

Well, you do realize that it happened around 65,000,000 years ago, so there is going to be some debate among even scientists, but the leading theory is that a large comet or asteroid impacted the earth near Yucatan Mexico (the crater is still there underwater) and blasted so much dust into the upper atmosphere that sunlight couldn't get through (much) and so plants died off, then the animals who ate the plants died off, then the animals who ate the animals that ate the plants died off. The only things to survive were fish, bugs, lizards, some birds, and rodents. We evolved from the rodents (mammals). Lucky us.

There is compelling evidence however that dinosaurs didn't die off at all, but rather gradually changed into birds. If you look at an ostrich, for example, it isn't hard to imagine it wandering the earth as a dinosaur 100,000,000 years ago.

Answer 5

The reason the Dinosaurs died out was because of natural selection, it isn't survival of the fittest, it's survival of the species most adaptable to change whether or not that is climactic changes or other forms of changes for instance when the meteor hit the earth it threw tons upon tons of volcanic ash into the air when the shock-waves triggered massive eruptions on a planetary scale, the temperatures changed and air quality changed and plants and vegetation began dieing out, the Dinosaurs were very fit creatures but the fitness of a creatures doesn't always mean it is best suited for survival, Dinosaurs just couldn't adapt to the environmental changes going on world wide so they died out and smaller creatures most likely related to marsupial rodentia became one of the survivor of this extinction level event.

Answer 6

There r at least 2 theories I know of--first, as Niranjana S pointed out, a comet hit the Earth, & there was huge cloud of dust, sulphur & soot, which cut out sunlight for a long time & made the Earth really cold (remember, dinosaurs were reptiles, & hence, cold-blooded).
The other thoery is that the species, which were their staple food perished & hence the dinosaurs themselves. Bye. TC.

Answer 7

evolution is taking place since the beginning of the life,wr the law wch is followed is "the survival of the fittest".dinosaurs were very huge animals n were not able 2 survive in the evolution.the changing environmental conditions made them die.

Answer 8

Just read about a new theory saying volcano eruptions caused global warming which caused deadly gases to raise from the oceans killing everything alive.
Ujuj.

Answer 9

an asteroid impact 65 million years ago.

Answer 10

my grandfather !!!!!!!!!he was such a great warrior