How long ago did Dinosaurs die out? What happened?
361629
millions of years ago.....\n a meteor hit the earth causing the dust, dirt, sand, and other particles to fly into the air and stay. at this time the particles caused a darkness which blocked the sun whit prevnted the plants to grow & the herbivores died.... when the herbavores died the carnivores died because herbavors were thier main source of food.
11677
Technically dinosaurs were not even known to have exist until the first evidence was discovered in either the 18th or 19th century. In the book of Genesis note: not to be interepted literally!! It states ( after the life in the sea,animals on land) Sorry I can't quote exactly however; look at all the animals that exist. The Bible would be a LONG book!
175862
Sadly, there are no dinosaurs left living today.  All evidence indicates that they completely died out 65 million years ago, at the end of the Cretaceous period.\n\nThere is some evidence to indicate that birds are descended from one branch of the dinosaurs (not everyone agrees on this), and so in some sense it could be said that dinosaurs are not truly extinct, but that's like saying that since we're still around the Australopithecines are not extinct.  \n\nThe animals that bear the characteristic features that lead them to be classified as dinosaurs are indeed extinct.\n\nCrocodiles and alligators are somewhat related to the ancestors of the dinosaurs, but are not and never were dinosaurs themselves.  They share some of the features of the dinosaurs (teeth set in socketed roots in the jaw etc.), and are the most 'advanced' reptiles alive today, but they are not dinosaurs.\n\nThere are some who claim that creatures such as the Loch Ness Monster ('Nessie') are Plesiosaurs that somehow managed to survive for millions of years, but there is very little evidence to suggest that Nessie actually exists, and even if she did, Plesiosaurs were not Dinosaurs.  They're Plesiosaurs, a totally different lineage with considerably divergent skull morphology from the Dinosaurs.\n\nThere is a creature rumoured to exist deep in the jungles of the Congo, known as Mkele Mbembe.  Descriptions of Mkele Mbembe sound as though they might (might) be describing a small sauropod Dinosaur of some kind.  If Mkele Mbembe exists (doubtful), and it turns out that it is indeed a living Dinosaur (also doubtful) then we would have a living Dinosaur still on the planet, and we'd have to try and figure out why no Dinosaur fossils have shown up anywhere on Earth in that 65 million year span.
704239
No, the Earth is much much older.  This is why the Bible is not to be taken literally.  If anything, we were meant to eventually point out these inconsistencies.  The truth is that the dinosaurs existed a long time ago (dragons) and were created to be just another amazing addition to life here on Earth.\n\nThe dinosaurs existed at a time when gravity as we experience it now was attenuated, and we experience much muss less of it.  This is how dinosaurs like the ultrasaur and massive bids like the teratorn were able to walk and fly around without collapsing under their own weight.
77663
Adapted from Dinosaurs: The Very Latest Information and Hands-On Activities From the Museum of the Rockies, by Liza Charlesworth and Bonnie Sachatello-Sawyer. A Scholastic Professional Book.\n\nWay back in 1676, Robert Plot, the curator of an English museum, described and drew a thigh bone that he believed belonged to a giant man. Although that fossil disappeared without a trace, the surviving illustration suggests that it may well have been part of a "Megalosaurus." Later, in 1822, large teeth discovered in England by Mary Ann Mantell and her husband, Gideon, were thought to be the remains of a huge and extinct iguana. It wasn't until 1841 that British scientist Richard Owen came to realize that such fossils were distinct from the teeth or bones of any living creature. The ancient animals were so different, in fact, that they deserved their own name. So Owen dubbed the group "Dinosauria," which means "terrible lizards."\n\nAcross the ocean in North America, dinosaur tracks were studied in the Connecticut Valley, beginning in the 1830's. They were believed to belong to enormous ravens, freed from Noah's Ark after the Great Flood. At that time, paleontology was long on deduction and short on evidence. This was remedied when two wealthy and competitive American scientists, Othniel Marsh and Edward Cope, raced to excavate fossils in the Rocky Mountain region. In the late 1800's, their separate teams, armed against Native Americans and each other, dug up tons of bones from several sites. All in all, Marsh and Cope's rivalry — known as the Bone Wars — uncovered 136 new species. And their respective fossil displays generated excitement for dinosaurs the world over.\n\nIn the 1900's, enthusiasm for dinosaurs grew steadily, attracting the attention of the scientific community. Institutions such as the Carnegie Museum of Natural History and the American Museum of Natural History assembled dig teams, which uncovered many rich bone beds in North America (as did their counterparts overseas). New sites in Utah revealed several different species, including "Camarasaurus," "Apatosaurus," and "Stegosaurus;" "Tyrannosaurus rex" remains were found in Montana and baby Coelosaurs in New Mexico.\n\nIn recent decades, dinosaur research continues, but the emphasis has shifted from finding and classifying these animals to analyzing and reconstructing their lives and habitats. In the late 1960's, Robert Bakker proposed that these ancient creatures may well have been as agile and energetic as warm-blooded animals. In the mid 1970's, Peter Dodson, along with James Farlow, hypothesized that they used their horns to attract the attention of females, as well as for fighting. And in the late 1970's, Jack Horner made history by identifying some of the first dinosaurs nests and eggs in North America. These important "Maiasaura" fossils helped to determine that some species nested in colonies and cared for their young.\n\nIn the past few years, several paleontologists, including Ken Carpenter, Phil Currie, and William Coombs, have identified juvenile dinosaurs that were previously thought to be adults; and David Weishampel has theorized that some dinosaurs probably used their crests and nasal passages to create sound. Each day, scientists working all over the world, in the field and in research labs, help to redefine the meaning of the world "dinosaur."
404949
Well, I gotta tell you that there's a lot of them.  The paleozoic spans a period from roughly 560 million years ago to roughly 240 million years ago.  There's a LOT of them - the periods are the Cambrian, Ordovician, Silurian, Devonian, Mississippian, Pennsylvanian, and the Permian.  Then we go into Mesozoic life.\n\nI guess maybe an answer would be the types of fossils we find: multicellular organisms, with amphibians being the dominant land animal in the later part.  Dinos don't come around much until the Mesozoic.\n\nOther than that, you get all types of sedimentary rocks and forms as you do now.  Hope that sort of answers your question!
917852
Dinosaurs are archosaurs, a group that includes crocodiles, birds, and all the descendants of their most recent common ancestor. The closest relatives of dinosaurs, which evolved with them in the Middle and Late Triassic (about 225 million years ago), include the flying pterosaurs and agile, rabbit-sized forms such as Lagosuchus and Lagerpeton. The common ancestor of all these forms was small, lightly built, bipedal, and probably an active carnivore or omnivore. Somewhat larger, with skulls ranging 15–30 cm (6–12 in.) in length, were Eoraptor and Herrerasaurus from the Late Triassic of Argentina, and Staurikosaurus from the early Late Triassic of Brazil. They were thought to be primitive saurischian dinosaurs, but it was later determined that they were outside the group formed by Saurischia plus Ornithischia, a view generally followed. In reconsidering these genera plus the more recently discovered Eoraptor, it has been argued that all three are both saurischians and theropods. However, they lack some features of both groups, so their position remains controversial. This testifies to a burst of evolutionary change at this very interesting time in vertebrate history, and it shows that there are a variety of taxa that are very close to the origin of dinosaurs. The first definite ornithischians and saurischians appear at almost the same time as these taxa, though dinosaurs remained generally rare and not very diverse components of terrestrial faunas until the beginning of the Jurassic Period (about 200 million years ago).
360085
PANGEA is was just a big land mass and a lot of water arond it. I am sure there wasnt a lot of living creatures cause them dang dinosaurs done ate everything but themselves and than i am not even sure about that
330500
since the Jurassic Era
693237
You have 5 major extincion events in Earth's history:\n\nThe more famous is the K-T Extinction Event aka the day the dinosaurs became oil about 65 million years ago.  That killed the majority of the animals on land, sea and air.  \n\nThe most powerful was the one that occurred 251 million years ago and took 95% of all life on Earth.  Use the link to find about the rest.
207570
It is assumed that ancient humans of about 13 - 15,000 years ago killed them off through over-hunting. Others think that disease also might have helped. The actual times when mammoths became extinct varies from place to place.  The last mammoths were probably a small population in the Aleutian Islands.
634900
1) A mass extinction is an across the board extinction of many species, genre, and phylum. The most famous was the dinosaurs, not one survived. There were many species and genera that did not make it. The dinosaurs were not the only ones who perished in this mass extinction event.\n2) Second part is that it occurs in a relatively short period  of geologic time (few million years or shorter). \nWe do not know what caused the mass extinction in the past.\nA less significant extinction would have less groups involved, for example just a few species of a genre but most survive. \n We  can only speculate, we are pretty sure that the dinosaurs were wiped out by a major bolide impact about 60 million years ago off the ukitan peninsula. There is zircon found in concentrated amounts across the plants oceans witch is indicative of a bolide impact. Also about the same time there were major volcanic eruptions on the other side of the planet which is now India, the combination of the two, could have caused the mass extinction of the dinosaurs. Be careful when you watch science shows on NOVA or Discovery, a lot of the time they make scientific theory out to be a proven fact.
655258
Actually the god of dinosaurs and the god of man had a bet going on to see who could do it better.  the god of dinosaurs had his 10 million years, now its the god of mans turn.\n\nMan is killing himself, while the dinosaurs needed a meteor to kill them off. Next up is the god of 3 toed sloths.
188493
MEZOZOIC, CRETACEOUS AND JURASSIC PERIOD (FROM 125 MILLION YEARS AGO TO 65 MILLION YEARS AGO
1123972
The length of the year was about the same. The day has gotten a bit longer, so there were around 400 days in a year around 200 million years ago. For fossils only 6.5 million years old, there wouldn't be much difference (perhaps a day or two per year).
892655
Dinosaurs did evolve, that is why they were so successful for such a long period of time. However, it is very difficult for species to recover from catastrophic population declines. Remember also that the major extinction event that occured 65 mya was not actually the only mass extinction event that took place during the time of dinosaurs and mammal-like reptiles and that this extinction event wasnt actually as catastrophic as some of the others (the P-T event wiped out 95% of all life!). What instead took place was that small mammals held a niche which evolved into the many mammalian species we have today. \nIf you follow the geological time line from the tertiary period to late cretacious you will actually notice evolution occuring throughout dinosaur species. Dinosaurs diverged from large lumbering archosaurs into saurapods and therapods and adapted to a range of environments. And, of course, therapod characteristics are evident in modern day birds (this is still debated, not proven, though very strong evidence in support). \nI would highly doubt that humans, without technological advancements, medicine etc etc would be able to survive for as long as the dinosaurs did, or to withstand as many mass extinction events. Look back as far as the cambrian explosion and you'll see that all life has come a long way!
215464
Birds had already evolved from a group of relatively small predatory dinosaurs by the Jurassic (that is, the middle of the Secondary Age). No one knows for sure what killed many species (not only dinosaurs) at the end of the Cretacic Period (several million years after the origin of birds) but it was probably a combination of factors, including the large meteor. Maybe you're picturing the meteor as a gigantic bomb that just wiped everything from the Earth, but although the local effects of the hit must have been devastating, the rest of the world experienced other effects (such as darkening clouds) that were more gradual but also more lasting. \nThat being said, all species have finite existence, and the reasons for extinction and survival are many. Mass extinctions are like extraordinary combinations of the "ordinary" background extinctions that happen all the time in an evolutionary/geological scale. \nIn the Secondary/Tertiary boundary, many large animals went extinct while smaller ones survived (including us mammals!), so ecophysiological characteristics of those species may have something to do with their extinction (perhaps the meteor combined with other environmental changes). \n\nIf you're interested, there are good Evolution textbooks (Ridley or Price are modern classics) that deal with the different extinction patterns and factors.