Cretaceous

Over time there have been many theories as to how the dinosaurs became extinct, some of these include terrestrial stresses (such as lower sea level or global temperature) and radiation (Pasichnyk, 2011), but the 2 theories that have become the most widely accepted as they have the most amount of supporting evidence are the Impact Theory (otherwise known as the Alvarez Hypothesis (Smith, 2005)) and the Volcanic Theory (Pasichnyk, 2011). The Impact Theory states that millions of years ago a comet…

Meghan Lewis Dinosaur Case Study September 25, 2017 Introduction Imagine if after 6 million years of existing on earth, the entire human race died out by the year 3320. Within a mere 1000 years’ all of humanity would be wiped from existence. This was the case with the dinosaurs and many other species living in the Mesozoic-Cenozoic period. 65 million years ago a meteorite roughly 10 km across hit the earth’s surface, and the impact would be a catalyst to the extinction of 75% of the species…

Dinosaurs In The Jurassic Time Period By: David Wallace This project is going to be based on some of the dinosaurs in the Jurassic Time Period and it will give information about that dinosaur as well. Vertebrates taking to the air like the pterosaurs and the first birds. This was the Jurassic Period, 199.6 to 145.5 million years ago, a 54-million-year chunk of the Mesozoic Era. Air, land, or sea, dinosaurs came in all shapes and sizes in many different places around the world. The first…

Most animals especially marine species on the Earth right now are struggling to face one major problem that they cannot resist it from happens which is extinction of their own kinds. This issue is what most human just ignore about and they tend not to deal with it. History of Earth shows that there are five major extinction events and the fifth extinction is the one that killed every dinosaur on the Earth surface as a result of an asteroid. Earth is now in the eve of sixth extinction as humanity…

This article is intended to discuss the causes that led to the death of the dinosaurs. It mainly exposes the two alternative hypotheses that might have caused this mass extinction by explaining the main reasoning behind each of these premises. The author exposes the points of views of different scientists and geologists in regards to the death of the dinosaurs, which- somehow- remains one of the most heated and contested “battles in science”. Particularly, the paper explains the stance of one…

The Permian Period The Permian Period is the last one, after the Carboniferous Period, of the Paleozoic Era lasting for about 46 to 47 million years from 299-252 million years ago (mya) (Smith 2011). One major feature of this period is the formation of the supercontinent, Pangaea which affected the environment and the climate as well which gave rise to new species. Another distinct feature is the greatest mass extinction event which killed around 54% of all marine families and most of the…

What’s the Right Theory About the Dinosaurs? In many theories about the dinosaurs disappearing many say meteors are the reason, is that true? The many theories about dinosaurs disappearing is a huge meteor or asteroid,climate change, volcanic eruptions, lava,and fractured crystals. At the same time there are over 40 theories of why the dinosaurs disappeared, but I only listed the most important ones that were mentioned the most. The biggest theory of all of them is the Asteroid , people think…

tion Questions Alannah Dodd Period 2 1. Explain the title of the book The Sixth Extinction is a book all about the fact that the earth as we know it has proceeded through 5 “waves” of mass extinctions, and is currently in the middle of yet another wave of mass extinction (the sixth). These “unnatural” occurrences have displayed shocking changes to the variety of species on the globe, hence the title: “The Sixth Extinction, An Unnatural History.” 2. What gave people the idea…

In her book The Sixth Extinction, Elizabeth Kolbert writes that there have been five mass extinctions in the history of planet earth. She asserts that currently the earth is on the precipice of a sixth mass extinction. In contrast with the previous five, according to Kolbert this sixth extinction is almost entirely caused by humans and our exploitation of the earth. In each of the book’s thirteen chapters, Kolbert highlights a particular species that is now extinct and analyzes the causes and…

THEIR ARE MANY MANY THEORIES ON WHY THE DINOSAURS BECAME EXTINCT THE CAUSE OF THIS MASS EXTINCTION VARIES WIDELY. Some of those theories are that Years ago an asteroid crashed onto Earth’s surface. Mountains formed within minutes. In America, a tsunami hit covering plants and animals, under piles of rubble. Debrie was scattered, The planet was broken down and it stayed that way for years. But the most clear explanation to why the dinosaurs rapidly died out with the Mose scientific evedence is…