What killed the dinosaurs, Asteroids, or volcanoes?
Probably both. The K-T boundary is pretty well defined by a worldwide iridium layer in the sedimentary record which would have had to be the result of some kind of impact. The question is whether it would be a large enough event to kill off the dinosaurs in one go. Interestingly (in fact I only found out about this when I was looking for things regarding this question) there is another hypothesis which suggests the chicxulub impact predates the mass extinction by 300,000 years and that there were multiple impacts. The hypothesis I tend to find more believable as the initiator is the Deccan traps. A flood basalt formation that large, thought to be emplaced over only a few 10s of thousands of years would have released a huge volume of gas. It would have been easily large enough to cause substantial climate changes, pretty much the same extinction method as is put forward in the impact hypothesis. You should also note that the largest mass extinction (end Permian) is thought to have been
The Chicxulub impact c 65.5 million years ago is by far the most plausible agency of mass extinction at the time. Termination of the dinosaur and ammonite etc fossil record at/just below the impact horizon has been noted in K-Pg strata for years. It is true that Keller has challenged the Chicxulub theory, based on Cretaceous marine fossils stratigraphically above the impact horizon in the Yucatan. But others consider that tsunami deposit. As for Deccan volcanism, researchers have long noted it failed to eradicate the dinosaurs even locally, in India. Dinosaur remains occur not just in the infratraps but the intertraps–proof of survival after successive local eruptions. The only evidence suggestive of an non–impact factor is the apparent demise of certain dinosaur groups 1-2 million years prior to the K-Pg. The disappearance or waning of nodosaurs, lambeosaurs and centrosaurines might have been due to orogeny, regression or conceivably, the rise of the archpredator T. rex.
Reptiles never stop growing. Back in the days of Adam and Eve up until the days of Noah people lived 900 years which is about 10 times longer than the average lifespan today. If people lived longer, then more than likely animals would have lived longer as well, including lizards. If lizards lived 10 times longer, and reptiles never stop growing until the day they die, then they’d grow about 10 times bigger. So instead of having a 3 ft. long iguana like we have today, back then they’d have a 30 ft. long iguana. One of the very first dinosaurs ever found was called the iguanadon because of it’s resemblance to the iguana. The man who found it said that it’s skeleton looked just like the skeleton of the iguana except it was alot bigger. Well guess how big it was? 30 feet! Scientists have found fossilized remains of crocodiles that reached up to 40 to 50 feet in length. They’ve found remains of sea turtles that reached enormous sizes much bigger than any sea turtle today. Now, fossilization
