In what ways does do scientists think dinosaurs became extinct?

Answer 1

Some scientists blame comets for the lack of dinosaurs on earth today. They hypothesize that a large comet collided with our planet long ago. This resulted in great clouds of dust in the air, which shielded the sun and cooled the earth's climate for many years. Since dinosaurs could not adjust to the colder weather, they perished. This is just one of many theories about the demise of the dinosaurs. The list of suggested catastrophes, both on the earth and in the sky, is considerable. Some of the other astronomical events used to explain the death of dinosaurs are:

The sun became either too hot or too cold for dinosaurs.
The world's climate became either too dry or too wet.
A supernova exploded nearby, spraying the earth with radiation.
Earth 's magnetic field reversed, and incoming radiation killed most life.
A passing comet poisoned the earth with chemicals.
A giant meteorite crashed into the sea, and a tidal wave then swept the land and drowned life.
There is a lack of supporting evidence for any of these events! Instead, creationists suggest that most dinosaurs died as a result of the great flood described in Genesis 6-8. Dinosaur types which were preserved on the ark probably faced severe climate changes following the flood. Creation research continues to demonstrate the importance of the worldwide flood in explaining earth's history.

http://www.creationontheweb.com/content/view/3842/#29

The meteor theory has some major problems:
The extinction was not that sudden (using evolutionary/long age interpretations of the geological record). But the spread in the geological record makes sense if much of the sedimentary deposits were formed in Noah’s Flood.

Light-sensitive species survived.

Extinctions don’t correlate with crater dates.

Modern volcanic eruptions don’t cause global extinction patterns, even if they cause a temporary temperature drop.

The iridium enrichment, supposedly a key proof of meteor impact, is not nearly as clearly defined as claimed.

Drill cores of the apparent ‘smoking gun’ Chicxulub Crater on the Yucatán peninsula in south-east Mexico do not support the idea that it is an impact crater.

It seems that some scientists didn’t speak out against the idea for fear of undermining the ‘nuclear winter’ idea, and being grouped with ‘nuclear warmongers’.

http://www.creationontheweb.com/content/view/2426

Answer 2

1. A big meteor hit near what is now Yucatan Mexico. This caused local deaths immediately, and the climate change caused by the dust in the air caused a mass extinction event over the next couple of years. The "smoking gun" is the Chicxulub Crater, and the layer of fossil dust containing iridium at the K-T (Cretaceous-Tertiary) boundary.

2. Biodiversity of the dinosaurs had been decreasing prior to the meteor strike. We don't know why.

3. Grasses were a relatively new development at the end of the Cretaceous. It may be that its appearance marked the disappearance of dinosaurs that had eaten other vegetation that had been displaced by grass.

Answer 3

everyone says it was a meteor but think about it was it really a meteor???? or is that the only answer they have at the moment whats to say in 5-10 maybe 100yrs time they trully find out how they died and we were all wrong no-one can say for sure unless of course you invent a time machine and go back and look ha ha

Answer 4

The most accepted theory is the Impact of an Asteroid.
Check this link:
http://www.lpl.arizona.edu/SIC/impact_cratering/Chicxulub/Chicx_title.html

Answer 5

You don't see a T. Rex walking around do you????? But decedents of dinosaurs still exist in the form of birds.

Answer 6

by the fossils and bone samples they collected

Answer 7

There are no facts in science, only theories.

Answer 8

a big bugger of an asteroid had something to do with it..i think

Answer 9

meteor shower