fati 0 Posted March 21, 2004 (edited) :hi: while going through many websites and encyclopedias.... i went through different views about dinosaurs and their extinction. some of them were very interesting.. i never heard of them b4.... DINOSAUR. To see the fossilized bones of ancient dinosaurs, go to a museum. To see living descendants of dinosaurs, just find some birds. A bird may not fit the common notion of dinosaur (dinosaur means "terrifying lizard"), but scientists are certain that all birds are direct descendants of a small meat-eating dinosaur. Birds can be considered the feathered crown of the dinosaur family tree. Birds' lizardlike ancestors died out 65 million years ago For about 150 million years the predominant land animals on Earth were the dinosaurs, all of which were very different from any of the land animals known today. Dinosaurs appear to have been neither warm-blooded like birds and mammals nor cold-blooded like snakes and lizards. Like modern reptiles, however, dinosaurs had hairless bodies and most, if not all, laid eggs. Many dinosaurs walked upright like modern birds and several mammals, and a few walked on all fours like lizards and crocodiles. Scientists classify dinosaurs within a larger group of animals called archosaurians, which also includes crocodilians (crocodiles, alligators, and their relatives), pterosaurians (extinct flying reptiles such as Pterodactylus), birds, and thecodontians (the earliest archosaurians). The first dinosaurs evolved from a lineage of thecodontians, as did the first crocodilians and pterosaurians At least one class of dinosaur descendants lives on today: Aves, the birds. The ancestor of birds was a small, two-legged, meat-eating dinosaur When dinosaurs first evolved, there was only one landmass on Earth and it formed one gigantic supercontinent, called Pangaea. By the time the dinosaurs became extinct, this landmass had broken up into the continents that we know today, though their shapes and positions were very different from those of today. Dinosaurs lived throughout the ancient world, in habitats ranging from tropical forests to dry, sandy deserts. The Earth was generally warmer during the Mesozoic era. There were no polar ice caps, but there were already several seasons in the temperate regions. The world was a complex place with many different ecosystems, or communities of plants and animals, and in each of these ecosystems particular species of dinosaurs adapted to the climate and environment. The Extinction of the Dinosaurs All of the remaining families of dinosaurs, along with a variety of other animals, died out some 65 million years ago. Traditionally, paleontologists believed that the number of dinosaurs slowly declined for millions of years before they eventually disappeared. Many studies of fossilized plants point to a slow change in environmental conditions, leading to a generally cooler climate, and thus the gradual extinction of dinosaurs by starvation. Today, however, many scientists think that the extinction was sudden and catastrophic. This line of thought originated with the American scientist Luis Walter Alvarez, who in the late 1970s discovered evidence for an abrupt end to the Age of Dinosaurs. Right at the end of the Cretaceous period, traces of the chemical element iridium appear to have been deposited in soil around the world, along with what is known as shocked quartz a form of quartz produced only in colossal explosions. This deposit shows up today in excavations as a thin layer of boundary clay, so called because it separates sediments from the Cretaceous period from those of the Tertiary. Iridium is rare on the Earth's surface today, but it occurs in higher concentrations deep in the Earth and in meteorites that fall to Earth from space. It is therefore possible that an asteroid or comet, similar to meteorites in its composition, smashed into the Earth at the end of the Age of Dinosaurs. The dust thrown into the atmosphere would have caused a long period of darkness and cold during which a great many of the world's life forms would have died. Other scientists have suggested that a tremendous amount of volcanic activity could account for the same observations. In India, there is a 65-million-year-old layer of volcanic rock, thousands of feet thick, extending over a vast area. Incredible amounts of volcanic ash and dust, and possibly shocked quartz and iridium, would have been produced during the formation of this deposit. These huge eruptions happened right at the end of the Cretaceous period, at the same time that the dinosaurs became extinct. There are many other theories for the extinction of the dinosaurs, but none are seriously considered by most scientists. These theories either fail to account for the extinction of all the animals that disappeared or they are based entirely on speculation, without supporting evidence. It is important to keep in mind as well that not all animal life was affected by the extinction event. The ancestors of such familiar groups as crocodiles, turtles, frogs, salamanders, snakes, lizards, and insects all show little or no evidence of extinction 65 million years ago. If there was indeed a colossal impact, why would these sorts of creatures remain unaffected? A full scientific explanation of the extinction of the dinosaurs must explain not only how the mass extinction happened, but also how the survivors survived. After all, every living thing on Earth today has ancestors that survived whatever killed the dinosaurs. Edited March 21, 2004 by fati Share this post Link to post Share on other sites
fati 0 Posted March 21, 2004 (edited) another view.. this one is quite different. its from bible.. but who knows if its right or wrong. hmm still have a look at it. its interesting question: "why did they all go extinct. Did God destroy them? I mean they were the largest land animal, you would think they would be able to survive." I(writer) believe that Dinosaurs were created on Day 6, the same day as Adam. I believe that they lived for a few thousand years, until the flood came. Noah took 2 of every kind of animal onto the ark, including dinosaurs. The harsh post-flood environment made it hard for the dinosaurs to live long after this. Some may have been hunted to extinction, and others were unable to survive as they degenerated (part of the curse God placed on the earth when Adam sinned), and lost some of their original abilities (the T-rex lost use of its arms for instance, as they shriveled and became useless). Those who do not believe the Biblical account of Creation have to come up with other theories. (statement by the writer) How dinosaurs became extinct is one of the greatest questions of all time. And there are numerous answers, all very different from each other. Some have suggested that the dinosaurs were killed when a giant meteor hit the earth. Some people believe that the dinosaurs died from diarrhea, and others believe that they died of constipation. (this one seems to b ) ( seriously.. they've spent millions of your tax dollars trying to prove this ! ) There are also people who believe that Aliens abducted the Dinosaurs. (aliens...... ) - And they think that I'm (writer) crazy to believe that the dinosaurs not on Noah’s Ark died in the Great Flood. Even though 2 of every kind (not species) of dinosaur was on the ark, many drowned in the flood. its sometimes fun in knowing the history.. although its not very useful to us ...but knowledge has no limits! Edited March 21, 2004 by fati Share this post Link to post Share on other sites
cute_ooky 0 Posted March 21, 2004 Wooooooooooow Fatma thanx so much girl for this info. U certainly spent time to research all this.. Well ok u know what now I see why they put meteorite impact.. The quiz that I got was frum a website sumthing.. I dun remember the exact url but it was .edu meaning it was an educational website.. Ok since the scientists themselves are not sure abt this stuff, we will just have to assume that it was either constipation or diharreha .. oops I mean it was either meteorite impact or climatic cooling! :) Khush? ~coOkiE~ Share this post Link to post Share on other sites
fati 0 Posted March 22, 2004 lol.. ooky .. i think better is diarrhea. and abduction by aliens .. well who knows they might have died becoz of some disease like. hmm.. dinosaur flu or mad dinosaur.... this was entirely new for me... well disease is possible but... aliens.. nay never.. this was a joke about noah's ark.. it might b true.. i was kush with meteroite impact also ooky :) another view i heard of is that they died because of earth quakes.... and one more wonderful thing.. some writers.. i dont know whether they r scientists also. they say that dinosaurs arent extinct they r evolved.. so much evolved.. hmm birds are dinosaurs descendants.... sho innocent birds and so mostrous dinosaurs.. pity on the birds.. humming bird descendant of tyrannosaur... Share this post Link to post Share on other sites
fati 0 Posted March 22, 2004 Question: Why are dinosaurs extinct? Answer: I(writer) will have to write also that I have a different view . Namely that we are asking the wrong question. Dinosaurs did not disappear, they evolved. Many paleontologists now classify birds as a branch of manoraptorian theropod dinosaurs (where they evolved from). And they correctly, I believe, recognize that what really happened is that one group did go extinct (non-avian ones) but that one group evolved and remains one of the most viable grouping of animals we see -- the birds. Our classifications are somewhat artificial constructs anyway, and as we have begun to understand the evolutionary and phylogentic relationships of birds and theropod dinosaurs, I believe we need to rephrase the question, realizing that dinosaurs are still with us. This also deals with the problems of other groupings of animals that survived the extinction event at the end of the Cretaceous. Some groupings survived, and amongst the dinosaurs it was the avian branch of theropods who could adapt to the climatic changes (caused by continental drift and/or an impact) whereas other dinosaur groups did not. if you substitute the word non-avian dinosaurs for the word dinosaur then I think that this might be a better way to state what might have happened based on the evidence. I believe that impact was a major contributor to the decline of non-avian dinosaurs, but it may have been only the final factor in which changing climate also was leading to a gradual decline in non-avian dinosaurs. Share this post Link to post Share on other sites
cute_ooky 0 Posted March 23, 2004 Ohh wow sum other new views.. lolz Yeah Fati I red all ur personal views abt this complicated issue ;) Hey I think mad dinosaur is a good one :D Well lets just say for convenience sake they got mad dinosaur disease.. I dunno if the evolution point of view is accurate.. again all I gotta say is that u gotta check for the source.. wherever ur gettin the info. frum, u have to check how reliable the source is.. because u never know there might be a gradeschooler out there making websites and talkin abt his point of view.. or there can be educated ppl like us ;) who blv it was sum kind of mad dinosaur disease :D Fati thanx very much for the research.. It certainly increased my knowledge.. haan yeh batao yeh coolyar ke aur jahil kahan hain? Games section aur baton mai to aise age age hain and when it cums to education.. they run away :P Ohh well.. g2g ~coOkiE~ Share this post Link to post Share on other sites
fati 0 Posted March 23, 2004 o yeah about the source.. well it seems to b reliable.. it was also something like edu.. but even if its made by some kid.. still it increased ma knowledge well good point.. the reliabilty of source is very important..birds are descendants of dinosaurs. i got it from an encylcopedia. the rest is from net that dinosaurs r still with us . isnt the section already so flooded ooky.. our techinique of quiz game didnt prove to b soo good.. wasnt this one a game.... guys v arent making bombs here.. dont b so scared... :P neither the dinos will come out of ur screen to crush u.. but if u wont come here. me and ooky will do it lol Share this post Link to post Share on other sites
cute_ooky 0 Posted March 23, 2004 @ Fati.. Yar agar aur koi na mile to kahin mujhe hi shoot na ker dena.. Khaki ki tarah.. Hmm so the sources are reliable.. Now what?!?! Yar what kind of scientists live in this world.. They can't even figure out the reason behine dino's extinction!!! Fati lets start a research on this issue.. The univeristy in my city Univeristy of Windsor is known for one of the best research institutes in World.. Well I m starting my research.. Lets start wid the amino acids found in dino's body..(good practice :D) then we'll go on examining the evidence that they existed and afterwards the reason behind their extinction!!! ~coOkiE~ Share this post Link to post Share on other sites
NaDaN 0 Posted March 26, 2004 well i have no knowledge about thsi creature but they do remind me of one person! RUSH GALLER! pata chala kisi ko F-R-I-E-N-D-S Rush (Divied Swa.... forgot his ful name) Share this post Link to post Share on other sites
fati 0 Posted March 28, 2004 what nadan ..... ... i know dinosaurs better than this rush galler okky.. hmm not sure. may b hmm scientists.... there r so many of them with different views.... lol. there r scientists like darwin too.... dinos amino acids let me research on mine first :D hmm this seems to b a good idea.... but ooky. in this case v'll need a dino... :) y not gastric acids... one thing about dinos. some species of them used to swallow stones.... strange... but a question... how did the scientists find this one... there r only dino fossils.. were stones in their stomach till now???? or its just an assumption well... i never done so much research and on a thing like dino. gr8 fun and i have comeup with a reason of their extinction... look there can b zillion of reasons.. few of them got mad, few had a flu, few had diarrhea constipation. then a meteroite impact.. after impact few survived.. then they died of climatic cooling.. or lets take it the other way round.. climatic cooling and then meteroite impact.... but the most important and the base of all is GOD wanted them to die.. simple answer.... :D research complete :) Share this post Link to post Share on other sites
cute_ooky 0 Posted March 30, 2004 Wow.. research complete te topic close!!! :D Great work Fati.. ~coOkIE~ Share this post Link to post Share on other sites
fati 0 Posted March 30, 2004 wow.. i completed it in so short time Share this post Link to post Share on other sites
sanober qazi 0 Posted March 30, 2004 fati nice work Share this post Link to post Share on other sites
