how did the dinosaurs die?

Question

was it carbon12 poisoning?

Answer 1

"No. It was a giant meteor that wiped them all out." That's what scientists say. But, I have to say something on that:
Ok, there must've been dinosaurs all over Earth, and they say that a meteor wiped them all out. Well, how could 1 measly meteor wipe ALL of them out at once IF the meteor only struck one place on Earth. Huh? Huh? Huh?

Answer 2

The sudden mass extinction of the non-avian dinosaurs, around 65 million years ago, is one of the most intriguing mysteries in paleontology. Many other groups of animals also became extinct at this time, including ammonites (nautilus-like mollusks), mosasaurs, plesiosaurs, pterosaurs, herbivorous turtles and crocodiles, most birds, and many groups of mammals.[36] The nature of the event that caused this mass extinction has been extensively studied since the 1970s. At present, several related theories are broadly supported by paleontologists.

Asteroid collision
The asteroid collision theory, which was first proposed by Walter Alvarez in the late 1970s, links the extinction event at the end of the Cretaceous period to a bolide impact approximately 65.5 million years ago. Alvarez proposed that a sudden increase in iridium levels, recorded around the world in the period's rock stratum, was direct evidence of the impact. The bulk of the evidence now suggests that a 5-15 km wide bolide hit in the vicinity of the Yucatán Peninsula, creating the 170 km-wide Chicxulub Crater and triggering the mass extinction. Scientists are not certain whether dinosaurs were thriving or declining before the impact event. Some scientists propose that the meteorite caused a long and unnatural drop in Earth's atmospheric temperature, while others claim that it would have instead created an unusual heat wave.

Although the speed of extinction cannot be deduced from the fossil record alone, various models suggest that the extinction was extremely rapid. The consensus among scientists who support this theory is that the impact caused extinctions both directly (by heat from the meteorite impact) and also indirectly (via a worldwide cooling brought about when matter ejected from the impact crater reflected thermal radiation from the sun).

Multiple collisions—the Oort cloud
While similar to Alvarez's impact theory (which involved a single asteroid or comet), this theory proposes that a stream of comets was dislodged from the Oort cloud due to the gravitational disruption caused by a passing star. One or more of these objects then collided with the Earth at approximately the same time, causing the worldwide extinction. As with the impact of a single asteroid, the end result of this comet bombardment would have been a sudden drop in global temperatures, followed by a protracted cool period.

Environment changes
At the peak of the dinosaur era, there were no polar ice caps, and sea levels are estimated to have been from 100 to 250 metres (330 to 820 feet) higher than they are today. The planet's temperature was also much more uniform, with only 25 degrees Celsius separating average polar temperatures from those at the equator. On average, atmospheric temperatures were also much warmer; the poles, for example, were 50 °C warmer than today.[38][39]

The atmosphere's composition during the dinosaur era was vastly different as well. Carbon dioxide levels were up to 12 times higher than today's levels, and oxygen formed 32 to 35% of the atmosphere, as compared to 21% today. However, by the late Cretaceous, the environment was changing dramatically. Volcanic activity was decreasing, which led to a cooling trend as levels of atmospheric carbon dioxide dropped. Oxygen levels in the atmosphere also started to fluctuate and would ultimately fall considerably. Some scientists hypothesize that climate change, combined with lower oxygen levels, might have led directly to the demise of many species. If the dinosaurs had respiratory systems similar to those commonly found in modern birds, it may have been particularly difficult for them to cope with reduced respiratory efficiency, given the enormous oxygen demands of their very large bodies.

You could get more information from the link below...

Answer 3

The K-T event is a mass extinction, the 2nd largest ever (to the Permo-Triassic) is famous for the large bolide (extraterrestrial object) impact that occured off the Yucatan, creating the Chixulub crater. Glass from the crater is dated to 64.98 +/- .01 million years ago.

This event caused global devistation, evidenced by:
1) Differing Sr ratios from global wildfires
2) Microdiamonds from fried Carbon
3) Tsunami deposits found all over the southeast US
4) Stishovite (a variety of quartz which forms in extreme pressures)
5) Worldwide Iridium anomaly. Ir is usually found abundantly in space, but it is very rare on earth. All over the world, at the K-T layer, the amount of Ir is much higher than normal.

It is theorized that the impact created magnitude 12 earthquakes and blocked the sun for as long as 9 weeks.

There is no such thing as carbon 12 poisening.

Answer 4

There are currently three theories on this. All three would have resulted in environmental changes that would have caused the extinction. The first is that an asteroid collided with the earth. The second theory proposes that a stream of comets collided with the earth. The third proposes that increased volcanic activity in the late Cretaceous period led to a cooling trend that decreased both carbon dioxide and oxygen levels. I have not read any theories that propose carbon 12 poisoning.

Answer 5

Carbon 12 isn't poisonous. LOL.
A meteor landed off the coast of Yucatan Mexico, killing all the dinosaurs in the vicinity (which would be just about the entire hemisphere). Enough dust and soot was thrown into the atmosphere to make a "winter" that lasted for years. Lots of living things died... and the dinosaurs died too.

Answer 6

any action has an equal and opposite reaction, energy is transfer ed not lost. we'll any ways has anyone considered that if a large meteorite hit the planet that there would be a shock wave of energy that could reach around the world, basically one big ''f n''earthquake it may lose it's strength as the shock wave moves. how far the kill zone depends on how large the asteroid or comet is . but as goes for the dinosaurs they're already dead so lets worry about us first then we'll just continue digging up the bones and and selling them to museums.

Answer 7

A big meteorite hit the Earth and dust blocked the sun and it turned coled and became an ice age and the dinosaurs froze and died.

THE END

Answer 8

It's said that the fall of a big a meteorite killed them, because the dust obscured the atmosphere and thus the plants they ate died. So they didn't have food... I think, I don't remember where I read this.

Answer 9

They got hit by comets!

Answer 10

They heard a rumour that man was on his way...