Ordovician Extinction Research Paper

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,

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.

8. The periods in which there were mass extinctions are Permian – volcanic eruptions which spewed lava and put CO2 into the air which warmed the climate an estimated 6 degrees Celsius. The resulting of oxygen deficiency. And Cretaceous – asteroid or comet

The main dinosaurs that died off were Sauropod dinosaurs, long necked, four legged dinosaurs, and stegosauridae, class holding Stegosaurus. Other species that died include ammonites, similar to the living animals called nautilus, many marine reptiles, and bivalves, relatable to modern mollusca. Not much is known about this extinction. It is mainly linked to climate change. So far, no connection to volcanic activity or an asteroid has been made. This extinction gave way to the Cretaceous Period.

The warming of the Earth’s climate, the changes of waves in the oceans and the increased amount of carbon dioxide from volcanic activity and Siberian traps caused this mass extinction. Oxygen on Earth is essential for all living things to survive on Earth. Without oxygen all living things would parish. When the carbon dioxide levels rose, the oxygen levels dropped substantially. How do we

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.)

The Late Devonian mass extinction is one the ‘Big Five’ mass extinction in history of earth which occurred 374.5Ma ago. This extinction event saw at least 70% of species perished; where main victim of this extinction event were the major reef builders, stromotopoids, rugose and tabulate corals (McGHee 2012). Causes of this mass extinction event during the late Devonian gathered a wide variety of debate throughout the years whereby researchers researched substantial theories supported by evidences. The few

It was the second largest of the five major events, and its dates correlate with the start and the end of the most severe ice age of the Phanerozoic Era. Almost all of the major taxonomic groups were affected during this event, but marine communities took the brunt of the extinctions, wiping out one third of all brachiopod and bryozoan families (aquatic invertebrates), and groups of conodonts (eels), trilobites, and graptolites. There are several suspected causes for the mass extinction, with a heavy focus on climate change and glaciation driven cooling, in addition to the minor contribution of the elimination of several habitats from sea-level fall, and some volcanism. The specific statistics show that 27% of all families, 57% of all genera and 60% to 70% of all species became extinct during this

There is another theory proposed that posits that rapid sea level regression followed quickly by transgression caused the mass extinction, at least in the marine realm. According to Schoene and Geux (2010), δ18O values from fossil oysters suggest cool ocean temperatures immediately following the negative δ13C excursion followed by a period of warming. As shown in figure 2, during a time spanning approximately 300,000 years there was a positive carbon isotope anomaly (corresponding with a decrease in sea level along with cooling and glaciation) followed by a period of higher sea levels and a negative carbon isotope anomaly. These findings are consistent with rapid sea level regression-transgression lasting only approximately 290,000 years, which can only be explained

According to the book, the extinctions are occurring in all branches. A third of all reef-building corals are endangered. So are a third of all freshwater mollusks, a third of sharks and rays, a quarter of all mammals, a fifth of all reptiles, and a sixth of all birds. Human activities have compromised the oceans, the original source of life and home still to much of the earth’s plant and animal life. Logging, converting forestland to other uses, and human-induced climate change were exterminating whole species of trees as well as the plants and animals they sustained. It seems true that Earth is a big place, but size isn 't everything. The planet 's richest ecosystems are in rapid decline, forcing us to acknowledge that countless creatures worldwide are running out of room. We should definitely do something to avert the first man-made mass extinction.

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

There have been five well known extinctions on this earth. The one most well known is the mass extinction that ended the dinosaurs. Mass extinction is often described as the elimination of a large number of species in a short period of time. Despite what many think, the elimination of species is almost commonplace at this point. The Earth is currently in the middle of a sixth mass extinction, and it’s been caused by the human race.

Habitat destruction, deforestation, ozone depletion, global warming, and poaching. These actions and ecological happenings are creating a world where animals are going extinct at rapid rates. Our world is on the brink of what scientists believe is the sixth mass extinction. Unlike the five previous mass extinction, the latest one killing a majority of the dinosaurs, the main causes for this current extinction are anthropogenic reasons, not natural events.

Over 98% of all organisms that have lived on Earth are now extinct. A mass extinction event occurs when a large number of species die out within a small time frame (relative to the age of Earth). Mass extinctions are intensively studied for both cause and effect, as there is usually room for debate regarding catalysts that precede the extinction and the massive influx of new biological species that follows. There have been five major mass extinctions, dubbed the “Big Five,” that have wiped out at least 50% of the species living at those times. The most well known mass extinction of the Big Five, with the decimation of every species of non-avian dinosaur, is the Cretaceous-Paleogene

The biggest mystery surrounding the dinosaur is how did they die? For over 130 million years dinosaurs ruled the earth. Then 65 million years ago, at the end of the Cretaceous period, they died out.