Dinosaurs extinction. volcanic eruption?

Question

can you expalin it simply please?

all the sites of the net confuse me.

Answer 1

Well if the dinosaurs dyed out because of the volcanic eruptions, it wouldn't have been that alone. The clouds from the eruptions would have blocked out the sun and caused all life to end because there would have been no heat or warmth. I personally don't believe that theory because they have found iridium all over the world which a very rare substance on Earth and commonly found on asteroids. Maybe the asteroid hitting Earth could have triggered lots of volcanic eruptions? Who knows.

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Answer 2

lol I believe they ate each other =)

Nah lol i'm not into this but i know some thing about this

Umm The volcanic Eruption is pausable but there is not a lot of evidence

and there is barely any evidence for lots of theorys that is why there are no facts

And the volcanic eruption would kill like 20% and the "smoke" would have blocked out the suns heat and you couldn't even see the sun so no food for the guy that eat Plants and then dinosaurs starting to die out so then they ate each other until the last guy Prob toughtist dies and there it goes

Answer 3

The basic idea is that strong volcanism at the end of the Cretaceous (especially the Deccan traps, which involved incredibly huge amounts of lava, nothing like humanity has ever seen) somehow caused the mass extinction 65 million years ago.

A major volcanic event has many effects life doesn't necessarily like. First, the dust and ash thrown up from the eruptions creates short-term cooling as it blocks some of the sun's light. Then, after the ashes clear away, greenhouse gases such as carbon dioxide still remain, which leads to warming on a longer timescale.  Another short-term effect is acid rain from sulphur oxides released by the volcano(es).

The main problem I see with the volcanic theory (although this isn't my area of expertise) is that some other similar events are not associated with mass extinctions (by the way, that is also true of asteroid impacts). In fact, even the Deccan traps started erupting well before the K/T extinction, so if they did play a role it must have been a long-term, slow destabilisation of the ecosystem.

In my *personal* opinion mass extinctions can't be explained by a single cause. I'm suspecting it must be an interaction between outside causes (such as an incoming asteroid) and the dynamics of complex ecosystems - but that's stuff for ecologists and mathematicians to study.

An article about volcanism, asteroids and mass extinctions that I found very interesting is in the 8th December issue of New Scientist, on p42. It deals with the very problem I mentioned above.

Answer 4

There were huge volcanic eruptions in India around the time the Dinosaurs went extinct (60 to 68 million years ago). The volcanic eruptions formed Basalt lava layers thousands of feet thick, called the Deccan Traps.

There is a theory that the gases released by the Indian super eruptions poisoned the atmosphere with sulphur dioxide (causing acid rain - killing plants and causing the Dinosaurs to starve) and carbon dioxide (causing a super green house effect - overheating the dinosaurs).

However, few scientists believe that Deccan Traps on its own caused the Dinosaurs to die out. This is because, when they carefully dated all the lava of the Deccan Traps, they found that most of the Lava erupted 66 million years ago, just after the Dinosaurs went extinct.

Today, most scientists think that the Deccan eruptions were just one of several contributing factors that led to the demise of the Dinosaurs, including the Chicxulub asteroid impact.

Answer 5

it is thought that a meteor impact in the Yucatan

was the primary cause of the extinction.

There certainly would have been enough vaporized

rock in the atmosphere to effect the weather for a

period of years and upset the ecosystem.

(The volcanic eruption of Krakatoa, [Wiki it], in our own

history was many times smaller and caused weather changes.)

(That Yucatan crater is about 90 Mi. in diameter, so I wouldn't

rule out the possibility of the impact triggering

volcanic events elsewhere.

The shock could also have triggered earthquakes

on any fault already under stress.)

The dinosaurs were specialized creatures at the top

of a food chain.

Disrupt the chain, .... and they die.

Answer 6

While an asteroid impact may be cause of the K-T extinction, there are other theories about the cause of that mass extinction. Some of these other theories include:

Extreme volcanic activity  and the accompanying acid rain could have changed the Earth's climate enough to trigger a mass extinction. The late Cretaceous was a time of high tectonic activity and accompanying volcanic activity . The supercontinent Pangaea was splitting up and the continents were taking on their modern-day forms. Extreme volcanic activity would spew dust and acidic chemicals (like sulphuric acid) into the atmosphere, causing global cooling, and perhaps, mass extinctions.