how dinosaurs disappared from the world?

ryukenden

Dinosaurs disappeared million years ago and some said due to a meteorite (comet) or climate change.

I would go for due to climate change.

What is your opinion?

S3nd K3ys

ashen

Some theories I've heard are :
1. Climate change
2. Meteorite
3. Evolution
4. Big disaster

But I think the most destructive event is when a big meteorite crush the land where the dinosaur live.

Alkmania

Evolution sounds more likable rather than one comet that wiped out all dinosaurs but let the whole earth intact Confused

jharsika

Technically it's all of the above. No matter what happened the climate changed and they weren't able to live on this earth anymore. Before the common dinosaurs we usually here about Trex etc, there were actually even BIGGER dinosaurs that died out then the smaller critters survived. Then those ones died and the smaller critters survived. It's kind of a pattern I guess.....but I'm rambling! I think something happened to make a big change come about, like a meteor hit, then the poles switched or something and the whole climate got messed up. You know the rest!

tiel_99

My take on this is probably a meteor impact which brought about climate change.

Just my opinion, but that seems to most logical.

Isn't it amazing just to think that there were huge creaure roaming this world we live in?

EekMan

Chuck Norris personally wiped them off of the planet Earth.

Laughing

I would have to say climate change. Those who weren't able to adapt, gone.

DoctorBeaver

[quote="EekMan"]Chuck Norris personally wiped them off of the planet Earth.

Laughing

quote]

That's the most plausible theory I've heard for a very long time! Laughing

faker_phil

osbits

One day, with the development of science(like time travel), everything will be clear.

bgillingham

I would have to say that I don't really believe that the dinosaurs have ever become extinct - today's birds are simply the progeny that survived the changes that happened - likely started due to at least one large meteor impact (some archaeologists believe that it was multiple meteors).

I thought that they all died from smoking cigarettes (Far Side cartoon by Gary Larson).

I believe that ultimately, the inability of the classic dinosaurs to adapt to global climate change caused their extinction. If you can say that dinosaurs classically have no feathers - and that feathered dinosaurs are not dinosaurs -- then I have no argument other than many feathered dinosaurs have been found (and several fakes have made the scientists look bad with the National Geographic enthusiasm to print the findings).

Mass extinctions have happened many times before and since the mass extinction that finalized the fate of the classic dinosaurs. Climate change usually due to volcanic activity has been linked to just about all of the mass extinctions. The food chain breaks down when foundation foods can not survive the new weather. Larger animals that ate their veggies -- would thin out depending on how diverse of a diet they had, and larger meat-eaters would be the next to die off if the herbivores couldn't survive.

There is a lot of recent evidence that shows that smaller feathered dinosaurs lived on and due to the massive change of environment, survivors were quickly narrowed down to only the most bird-like progeny.

I have to wonder why the feathered ones survived - and the large pterodactyl type died off. This must suggest that the food source for the "birds" was sufficient throughout the time following the big global climate change(s), but the food for the larger pterodactyl was either becoming extinct, or competition for remaining food sources was too great for them to overcome.

I just finished reading "Origin of Species" by Darwin, and it really makes you understand the problems that theories based on geological record have. He really explains how fossils of one species could be plentiful in one area, and not found above that layer -- but still proves that the animal in question could have simply avoided the conditions that make fossils (geological lifts cause more deposits in some areas, but the duration of deposits is limited to the amount of silt that is available to cover any bones).

Sokken

Another thing is that today our atmosphere contains much less oxygen and with less oxygen creatures will be smaller. There were also one meter long insects at the time of the dinosaurs.

Probably something made the climate change, this made some species extinct but also made them evolve because the most succesful creatures was no longer the giant dinosaurs, instead it was small dinosaurs and other smaller animals.

The dinosaurs as we think of them wasen't extinct over short time but over long time. So maybe it was a giant meteor that triggered it. if it was I guess it is not wrong to say that the meteor was the cause.

Margalo

I remember hearing some ware (don't ask me where) that one meteorite is unlikely. That a large meteor and meteor shower wiped out a lot of them. And that there was a climate change that killed most the rest, but that then a second meteorite destroyed the survivors.

ColdFire

Revvion

I like the old meteor theory.
steps Razz

:
1) meteor crashed on earth
2) shockwave killed a lot, massive rubble and smoke covering the sky
3) oceans start boiling from the heat
4) al dinosaurs left die of massive loss of food

Jinx

The meteor theory is pretty strong, scientists have even identified what they believe to be the impact crater in the Gulf of Mexico along the northern edge of the Yucatan Penesula.

The impact would have caused an artificial winter that would have lasted for years. No sunlight, no growing season, no food. All that would be left are bugs that can live off carcases, creatures that could hibernate for long stretches, or little mammals that had stores of nuts and seeds.

If the super-volcano at Yellowstone were to erupt, it would have the same effect.

The meter long insects that someone mentioned were actually from before dinosours. They lived during the carboniforous period, which was an extremely warm period during earth's history. I remember reading that there was something like 700 times the amount of carbon dioxide in the atmosphere than there is today. Greenhouse warming to the extreme. It was a tropical paradise for gigantic bugs, though.

.Locke

I am also inclined to the meteor theory. They actually found a mineral in a layer of the earth's crust that only comes from space, and that mineral is present at the same level around the earth. This is strong evedence that a very large meteor hit the earth at that time.

If that said meteor hit the earth, it would have effected the earth's climate. Making it unlivable for the dinosaurs of that time. So they had to adapt to the new climates. So that would mean that dinosaurs would no longer exsist, but instead the new spicies that were evolved from them would.

m_furquan36

I would standby the change of climate theory brought about by the meteors,it seems to be the most proper theory.

gaurav.baral1

i would go for climatic change
we know that slowly earth's climate is changing.we are experiencing change in climatic pattern , particularly extreme type...today we are here because climate suits us but tomorrow our kind will get evolutionized to cope the change or die .
similar case must have happened for monsterous reptiles..they must have faled to cope with the change...

Arnie

Oh, so the dinosaurs had chemical industries and built power plants everywhere?

The climate change that would have killed the dinosaurs wasn't "slowly" like ours right now. It was suddenly caused and most people assume by a meteorite.

You can't compare the two. There are enough other topics for you to talk about climate change today.

dooble.doodles

I thought they just stuck their thumbs out and caught a vogon ship....

I think that is where they met marvin... Laughing

-----------

Or maybe the decaying magnetic field of the earth before a reversal in rotation happened. This could really cause a lot of havic on the surface.

TexasWes

Just to try and break a few paradigms out there...allow me to pose a question. If a meteor hit the Earth with such a catastrophic result, why did it select only dinosaurs and not all of the other creatures that have evolved since then?

I offer you an alternative view. Instead of something BIG that killed BIG animals...consider something very small--bacteria. The number of reptiles (dinos) that the earth could support (i.e. food) must be less than the number of small animals it can support (i.e mice). This is evident today in that there are fewer large animals than small animals.

Bacteria and other organisms CAN BE species specific. Plague (Y. pestis) can be lethal to a cat, but dogs are naturally immune. Parvo can be lethal to dogs, but humans are not succeptable. If the climate changed (pick your theory), then there could have been a rise in the numbers of vector-carrying insects. This in-turn could have caused a world-wide (although I believe dinosaurs weren't actually existing from pole to pole) epidemic (or pandemic) within the dino population. This would be similar to the plague pandemics that occurred in Europe--wiping out 1/3 of the human population.

Just a theory...let your minds stretch.

miacps

Thats an interesting theory, TexasWes.

However I would think that at least some isolated species would survive a plague.

I would have to go with a meteor that cause climate change which eventually lead to the Ice Age. Only dinosaurs with the adaptations of feathers (and small enough to find sufficient food sources) would survive because feathers are excellent insulators to keep the warm in and the cold out(also works in reverse too).

TexasWes

I agree Miacps...some species would survive. Most notably may have well been the amphibians within the dino-era population. Using the "adapt-or-die" model that nature subjects most everything to, those living in areas with intense insect populations (i.e. swamps) would need to become resistant to certain insect-borne diseases. This may be an associative factor as to why modern amphibians and alligators have not only survived over a great amount of time, but have done so with relatively little change (comparing skeletons of fossils with modern day species).

Another possibility is a plant blight that either infected and/or killed the staple foods of these large land creatures. Either by lack of food, or by ingesting large quantities of (potentially) toxic plant pathogens, the dinos could have been subjected to a foodborne illness on a rather large scale.

I guess I'm just a meteor-theory skeptic, as there are 1) not a lot of impact craters across the globe that correlate to a single event (i.e. the angle of impact from all craters does not indicate a single event worldwide), 2) a meteor-winter (similar to a nuclear winter) would wipe out more than just the large dinos, and 3) it seems that the aquatic-based animals fared better than the land animals--except the aquatic-dinosaurs--which also disappeared completely.

Regardless...all posts here are valid--just impossible to actually prove with the current set of data that we possess. Good bar-room discussions.

ralphbefree

hard to say without knowing, i guess i need to clear up a couple of variables first:

where humans around during dinosaurs?

how long do you think thier life expectancy was and how many do you think there where?

i mean we find some bones and such but not really wide spread that account for millions of dinosaur species.?

miacps

Fright Knight

Fright Knight

Fright Knight

Fright Knight

Back in primary school, I heard that the reason why dinosaurs gone extinct was that when the meteor hit the earth, thick layers of dust were produced covering the earth atmosphere with it making it hard (or perhaps impossible for the rays of the sun to penetrate and give earth its warm light.) because of that, the earth gone cold and ice age started killing all the dinosaurs because of too much cold.

That's what I have heard.
peace.

globacide

I guess the asteroid theory is the most comprehensible and most likely to be true.
Here is a summary of it:

Heroin

I think that where was climate change and to that big meteorite crashed the Earth and all that get together and fore the result we have I mean we don`t have dinosaurs Very Happy

bhzh

I used to think that too when I was obsessed with Dinosaurs a couple years back. Correct me if I'm wrong, but I seem to recall that these days the huge meteorite theory is being shifted off to the side and scientists are saying it is a combination of volcanic activity and a climate shift cause by said activity that killed off the dinosaurs. But hey, either way, it looks like it is a climate change that did this. Really scary after the Day After Tomorrow eh? Smile

Shin

Meteors triggers climate change or more specifically ice-age. Hence no more or not enough food for the dinosaurs.

Yjaxygames

I suppose (we will never know for sure) that a meteor crashed into Earth, that killed many dinosaurs because of the shockwave and the impact of the meteor. The atmosphere was full of dirt dust, blocking the sun. This changed the climate on the entire planet. The rest of the dinosaurs died.

rightcity

roboguyspacedude

I think that it must have been a meteorite or comet because nothing else could have been so destructive.

Shake

I would go for a combination of factors, including new species being introduced to the land, forcing older species out, and possibly some massive event that happened to destroy much of Earth's lifeforms. What I find more appalling than the extinction of the dinosaurs is that there are so few mutations in the world today, considering our supposed evolutionary background. I believe in evolution, but I also wonder sometimes why the world isn't MORE diverse than it already is. Why don't unicorns exist? You'd think they would, with how far Earth has come.

sbel

robohobo

They all went in a spaceship to the planet Crilon 4. I saw it all in an acid trip, it makes too much sense not to be right.

LostOverThere

Kitten Kong

noone really knows why the dinosaurs went extinct, most of the hypothesized reasons have been listed above, and most likely it was a combination of all of them increasingly making life difficult for them to survive, maybe some of them evolved into life more suited to their new environment, but they had a good run, a few hundred million years. If mammals (let alone humans) make it anywhere near that as the dominant life on this planet I would be greatly surprised.

Holy

Wouldn't man have disappeared too with the dinosaurs? It's very strange. Probably one of the great mysteries that will never fully be uncovered. All we can do is just speculate.

ajithn

They might have died because of their fights. All the dinasor movies show how they fight and kill each other

bond4154

Dinosaurs, as reptiles, are actually quite generally resistant to climate changes, so it had to be something of a large climate change...and the meteorite theory, IMO, doesn't make sense; I cannot imagine a scenario with a meteorite that would change the climate across all of Earth so bad to warrant the extinction of so many dinosaurs. I'm actually more prone to believe it to be some sort of virus or disease that was passed on through the dinosaurs, affecting some lifeforms and neglecting others.

jongoldsz

turbowolf

The comet collision is the main cause of the subsequent climate change.

But indeed the body of dinosaurs is too big to adapt the new climate.

Kitten Kong

Its perfectly reasonable to believe that a meteorite impact could wipe out the majority of life on earth and still leave the place intact, the impact itself is not what does the damage its the aftereffects, dust pushed into the atmosphere and staying there for years, blocking the sun, wiping out plants, animals, the wonder is that anything above bacteria survived.

Another possibility being studied is cosmic rays, for the most part the earths magnetic field deflects harmful radiation and protects us, but it is not impenetrable, every 62 million years our solar system does a revolution around our entire galaxy, at certain times the level of cosmic rays gets higher, higher than our magnetic field can easily protect us.

This is just another of the ideas being thrown around right now.

If you still don't believe that a meteor throwing up dust can cause mass extinction then look at an event as recent as 1815, a volcano in Indonesia erupted so violently that even in London the sky was covered for a year, crops died and so did thousands of hungry europeans. That was just a volcano, imagine a meteor impact powerful enough to leave craters such as the Chicxulub Crater. Further proof of the power of this is the 0.4mm layer of dust that can be found at almost every other point of earth from that time containing high amounts of Iridium, an element practically non-existent on earth but common is space.

roninmedia

I believe a space body impacted the Earth and induced climate change. The reason that the dinosaurs died while other species survived was the slow generation times and rate of reproduction of the dinosaurs. Remember that dinosaurs are more closely related to crocodiles than lizards despite their name meaning, "Thunder Lizard" and crocodiles have relatively long lives and don't reproduce as much lizards so with the large size of dinosaurs, it is exaggerated. And many reptiles, the temperature of the incubation can change the sex of the offspring during a certain period. A large temperature shift can create a massive imbalance in the sex ratio.

There may be even larger craters out there, but with time, they are largely covered up and so huge they are seen on ground level as a large basin. Remember, the Yellowstone Super Volcano Caldera was unknown until viewed from the air. It is large enough to fit the city of Tokyo in it.

knight_frost

No one lived that long, at the time when the dinosaurs roam the world. Infact the data we all have now are from bones or imprints they leave us. Many theories have popped up to become answers why they all die. And there were two predominant theories which I think where linked. The first theory was the climate change and the second is the meteorite explosion. The two events as scientist predicted happened simultaneously. Why the second theory which was the meteorite explosion was accepted because of proofs presented by scientist that certain minerals that found no similar composition anywhere in the globe was found so aboundantly in a certain part of the earth. This mineral is belived to come from the outerspace more like from a meteorite. THe explosion of the meteorite brought series of events at hand but it never wiped out all the dinosauria population. It was believed that after the explosion, climate change happen, more like a GLOBAL WARMING which resulted to a change of environment. But a proposal from the scientist that, this also was not only the reason of their extinction, since animals have an ability to adapt. Its a characterisitc that enables to live in any environment. The change of the climate did not kill the dinosauria population but it was the catalyst to their extinction. Prior to this many believed that the meteorite explosion does not only change the climate but there were event happened that where still under study. But the change of climate brought enough problems like food scarcity and abrupt change in environment which would some how alter the characteristic of the animal of the past. Maybe, on my part, they would have started killing each other which in turns help in their extinction..

poly

Yeah I think it was the meteor...

LostOverThere

Personally I think it was a Super Volcano such as Yellowstone erupted continuously causing rapid climate change.

chasbeen

Not all the dinasaurs were killed though. What about the Crocodile and the Comono dragons? These are not the biggest Dinasurs (Although at between 10 and 20 feet long there not small!) but they DID exist at the same time. You could say WHY DID SOME DINAUSAURS SURVIVE? Confused

starfish2007

i am still for the comenit or what ever that fall that cused it indirectaly since its hiting the earth and evenparishalyorfullyblocking thesun cused theclaimet tochange butit was theclimiet change that really killed them

Gagnar The Unruly

Wikipedia has very interesting things to say on the subject:

ratfungus

It was partially to do with meteors that resulted in a temperature rise and this rise in temperature caused a certain gas (I can't remember which gas) to be liberated (having been previously frozen in the cold depths of the worlds oceans) from the oceans and this, in turn, then lead to further temperature increases and it was this second round, so to speak, of temperature increases that put paid to most dinosaurs. As a previous post also said some dinosaurs survived and those that didn't took a long time (not in evolutionary terms - but in human terms) to die out (tens of thousands of years I believe). It was this global warming resulting in the demise of the dinosaur that resulted in the rise of the mammals. We (that is mammals) weren't superior - we just got lucky. Anyway that's my story and I'm sticking to it - I don't want Chuck Norris after me though. Very Happy

elite747

R-Jey

I totally agree to meteorit theory

durneata

My take on this is probably a meteor impact which brought about climate change.

Just my opinion, but that seems to most logical.

Isn't it amazing just to think that there were huge creaure roaming this world we live in?

denestry

Meteorite slammed into todays Yukatan peninsula. I think iridium proves it.

amicalindia

Ice age wiped them off just like it will wipe out current animal kingdom in next few centuries.

undergroundking_tourus

Because dinosaurs didnt signed the kyoto protocol

thinkfacility

I would agree with the climate change. However, the real question is, what CAUSED that climate change? It could be a variety of factors, meteor, aliens, all sorts of things...was it random chance though? Or was it on purpose from some sort of sentient species? I hear there was also an even more in-depth explanation.

Some scientist theorized that a meteor happened to knock loose a chain reaction that caused methane clouds to blaze over the planet released from the oceans and wiped out most of the organisms on the planet.

liljp617

Asteroid hitting near the Yucatan Peninsula, causing an extremely drastic climate change is quite plausible. There's plenty of evidence to support it...of course, there's nothing conclusive Razz

nepheus

They represent that a big meteor came to the Earth, shade the amosphere by dust. Thus, plants were died first, then were big types of animals, like dinosaur... To digg it, really hard 'cause all are supposition.

freegames

Evolution sounds more likable rather than one comet that wiped out all dinosaurs but let the whole earth intact

misterXY

[quote="DoctorBeaver"]

quex

A new hypothesis suggests insects and the diseases they carried at the time may have been the actual mass killer of the dinosaurs.

Link here: Science Daily, January 4th, 2008

I personally would give some credence to this one... the extended die-off is better explained by disease than an asteroid.

Yjaxygames

amicalindia

amicalindia

fully and unconditionally Wink

xbcd

i have don't know about them disappearing but i saw this awesome episode on History or Discovery about how they made ways to genetically recreate Dino. Like animals. They added a bigger tail to chickens and then added sharp teeth etc.

jeremyp

ciureanuc

"Dinosaurs disappeared million years ago and some said due to a meteorite (comet) or climate change...."
What is that: "dinosaurs"? A presumption, isn't it? Few bones putter together... and some IDEAS about what they were...
Well, for this presumptions you will find only... other presumptions! Smile

I am really interested what aliens think about The Statue of Liberty... Smile

quex

ciureanuc

I really, really hope that's just snark... it's sad, but some folks in the US still vehemently believe that "dinosaurs" are "a trick of Satan." This fact frustrates me to no end. (How can a first-world country let its people wallow in ignorance like this?! Gaaaah!)[/quote]

Dinosaurs are like axioms... you believe and that's it. Yes, I believe that they existed, no doubt, BUT... can you tell me that they were EXACTLY as they are presented in books?
Maybe I am too ignorant but it was discovered at least one full skeleton on dinosaur, or they "produce" stuff from "scraps"? How they do that? How they can be sure? ADN of the bones?

Bikerman

quex

Thanks, Bikerman. ^^;

HDirtwater

Actually, it's been scientifically established by Gary Larson the real reason dinosaurs are no longer on the planet.

Alaskacameradude

A really big huge flood. That's my theory

miacps

Bikerman

The flood hypothesis doesn't work - on many levels. There is no physics which could explain a 'global' flood (where would the water come from and go to?). There is no geological evidence of such an event and the fossil record does not support the existence of such an event...
There have been many large floods in history - glacial ice-dam melts and seas spilling over land-barriers are two causes - these are only fairly recently being understood properly. Non of these, however, could account for a global extinction event such as we see with the Dinosaurs.

deanhills

I believe it was a gigantic event like a meteorite. The species could not survive the event. After the event it took a long while for the world to return to normal, and possibly what is normal to us, would have been inhabitable circumstances for dinosaurs. I wonder whether if we had been in existence then, if we would have been the same gigantic size as they were. As maybe they were in size proportion of how the world had been at that time.

Makes one marvel and wonder anew of exactly where we are from. One thing for certain, we would not have survived alongside giants like that. As we are today, we would not have fitted in the order of things then. Or would we have? Mystery of life, and great that we can wonder and make theories and puzzle over all of this.

Wuppie

I have seen and read a lot about dinosaurs and how they dissapeared from earth, and I think the best explanation is that a big meteor crashed into the earth, creating a shockwave, much floods and the atmosphere got filled with dust and other stuff so the sun couldn't get through, which caused a major climate change. Many large animals, like the dinosaurs, died, smaller animals could survive more easily, and after many years the atmoshpere restored. Many animals died because they couldn't adapt to the new circumstances. The animals that could adapt, survived.
Of course it is more detailed than I am telling it but I think this is a good theory. But we'll never know for sure.

pmehta51

There was no dinosaur in the world. It is all fiction. All created imagination.

Bikerman

rheanna

lol , it's all speculation because no one was around when they did disappear! lol But, I love reading the theory's haha But, GODZILLA STILL EXSISTS!!!!!!!!!!

pmehta51----They do have the bones so I think that's your evidence there.

saratdear

I believe in the meteorite theory.

Has anyone read Megamorphs : At the Time of Dinosaurs? Although it is all fiction, I loved reading the theory of extinction of dinosaurs in that book as well.

flyfamilyguy

miacps

Bikerman · Last edited by Bikerman on Sat Sep 06, 2008 7:25 pm; edited 1 time in total

flyfamilyguy

Thank you bikerman!
I never heard of anything that you wrote of before now. YOU have enlightened me; lol!!!!

Bikerman