The Great Dying: The Permian-Triassic Death

The Cretaceous period is a period of time within the Mesozoic Era lasting from 146 million years ago to 65.5 million years ago. It is one of three periods in the Mesozoic Era along with the Triassic and Jurassic periods. The Cretaceous period is well known for the amount of dinosaurs it had, and the event that put an end to the dinosaurs reign, the K-T mass extinction. During the K-T mass extinction, a huge asteroid hit earth and caused tons of dust to infiltrate the air. Only a small portion of dinosaurs died on impact Instead, the dust blocked out sunlight which caused plants to die. Without plants, many dinosaurs did not have a food source, so the died out. Carnivore dinosaurs, such as the Tyrannosaurus Rex, survived a little longer

Planet Earth is 4.543 billion years old and has been home to multiple species of life. One of the earliest species to roam Earth is known as The Dinosaurs. An animal is classified as a dinosaur when it has been outdated or its culture extinctic. Dinosaurs lived 247- 66 million years ago in a time called the Mesozoic Era, millions of years before the first modern humans. Scientist divide the Mesozoic Era into three time periods.

Why, none other than the Permian-Triassic extinction event 252 million years ago, the planet's most severe extinction. The dinosaurs were just the highest-profile casualty of this event (possibly a meteor impact, possibly a volcanic event, theories abound), which wiped out 70% of all terrestrial species and 96% of all marine species. (Read those numbers again.)

this mass extinction is what brought us the jurassic period, and from the Jurassic period, or the

<b>Introduction</b><br>Think of a world which existed 290 million years ago. As you look out over the terane in front of you, you think that you are on an alien planet. You see volcanoes spewing ash and lava. Beside them is the ocean which is swarming with many different species of echinoderms, bryozoans and brachiopods. As you look down onto the sea floor you are amazed at the countless number of starfish and urchins. Some animals leave you can't even describe and you have no idea even what phylum they belong to. This is a world at its height in diversity of oceanic species. Millions of wonderous species existed at this time in the ocean and most of them will never appear again in earth's history. In the geologic time scale, a million

Trust in government does seem to be directly related to the approval rating of the president since the president is seen as the most important individual, as well as the most influential member in the White House. Where Stimson described national economy directly relating to trust in government, the three interviews more directly show trust in government is based on a different aspect, the state of the environment, not the overall economic standing of the country. Stimson believes that public opinion and presidential approval largely shapes the trust that citizens have in government. As seen by many presidents, such as Reagan, when the economy started to drop so does the presidential approval rating. Along with the quality of the economy

The Permian mass extinction, that struck about 250 million years ago, caused a mass extinction of reef and shallow water communities. Groups that lived on the seafloor and filtered organic material from the water for nourishment suffered the greatest extinction. Those include corals, shelled in-vertebrates, and a variety of sea lilies. Others marine groups includes trilobites, zooplankton and snails. Even though these species died in the water, living organisms on land were not much better off. Terrestrial vertebrates and insects both experienced a big loss in each of their groups. Also suffering a big loss was the insect family due to the lack of plant life and food. Seventy Eight percent of reptiles became extinct and sixty seven percent of the amphibian family became extinct during this time period.

Just the fact that the Pope has ignored the warnings of Catholic presidential candidates and is trying to fight climate change is monumental. Global warming is a global issue. No matter what religion or ethnicity global warming will affect everyone. Earth is the only known planet capable of supporting life. How embarrassing will it be for our generation if we wipe out life because of our ignorance. Earth has a marvelous ability to rebuild and return to a healthy state. After each of the five mass extinction events Earth was resilient enough to survive and so did life. After the most notorious, the Permian Mass Extinction, less than 4% of life survived. Miraculously Earth rebuilt its ecosystems and was able to sustain life. The causes of the

Triassic Period, The Triassic period was the first-time period of the Mesozoic era. This period occurred between 251 to 199 Million years ago. This was the period of diversification of the earth's ecology especially the marine creatures. Triassic Period is often known as the age of reptiles because there were a group of animals and plants that were extinct the Permian Extinction: One called the Therapsids, which were mammal-like reptiles, spiders, millipedes, scorpion, and centipedes but there was a new insect group of the Triassic period was the grasshoppers. Mosses and fern survived in the coastal regions you could find Lycopodiopsid, Puzzlegrass, Conifers, Cycad plants. Geologists said this period began and end when the large extinction

So what killed the dinosaurs? Without having any background education in science it is hard for the general public to comprehend such matters and they rely on the knowledge of the scientists in this field. Although there has been much research on the subject nobody has come up with a conclusive answer. And we are left to read the countless articles, all having their own opinions as to the mass extinction. One such theory is that a shift in the solar system could have caused the mass destruction. According to an article published in Nature magazine,

Dinosaur extinction: An analysis of events and theories that possibly led to the dinosaurs' demise.

Jurassic is a period of time with Dinosaurs, rodents and birds. There were also island seas consisting of sharks, sea monsters and blood-red planktons. The existing plants in that period were cycads, ferns and conifers. The Mesozoic era was about 245 million years ago to 65 years ago, so it almost lasted about 180 years in total. The Mesozoic era is divided into three periods of Triassic, Jurassic and Cretaceous. Mesozoic era means middle animals and it is the era, which the word’s fauna has changed from what is in the Paleozoic era and the most famous organisms of this era are dinosaurs. In the Mesozoic era, the extinction of more than 90 percent of species in the earth was observed and the reason behind it was mostly volcanic eruptions and climate changes. On the other hand, this era had massive changes that represented ecological niches and rise to new creatures such as rodent-size mammals and first dinosaurs. In Triassic, which was the first period of Mesozoic, the mammals and first dinosaurs existed. Later than that, the second period was Jurassic, which giant shaped dinosaurs and other kinds of dinosaurs were developed. Besides that the first flowering plants and primitive birds, with long teeth appeared in that era as well.

When, where and how did dinosaurs live? Dinosaurs arose around 200 million years ago and lived and evolved for about 185 million years. There were 5 eras in which dinosaurs were alive; the Archezoic Era, Proterozoic Era, Palezoic Era, Mesozoic Era and the Cenozoic Era (“Dinosaurs”). Dinosaurs roamed the entire Earth when all continents were

Nobody knows for sure exactly how the dinosaurs became extinct. However scientists have speculated for decades about possible events that caused the dinosaurs to die out. Possibilities range from asteroids, to volcanoes, to climate changes. One of the more popular or well-known extinction theories involves the belief that an asteroid struck the Earth, causing devastating effects, and triggering mass extinctions around the end of the Cretaceous period.

The Cretaceous time period was the last time period in which dinosaurs are seen. This time period spanned from 144 million years ago (mya) to 66 mya; right after the Jurassic time period and before the Tertiary. This is a time when dinosaurs were at their height with many thousands of different species known or yet to be identified. Our earliest ancestors were small rodent-like mammals that lived during this time and gradually evolved into the many different types of mammals we see today. The dinosaurs though, would become small reptiles such as the lizards we see today after one of the greatest known extinctions of all times-the K-T Extinction also known as the extinction of the dinosaurs.