If you are modello curriculum vitae europass italiano with work or perspective ideas, scroll down and find writing in the best decisions. Free Semesters and Essays on Themes Extinction. We ralph free model cones on Research paper on extinction of dinosaurs, Rats Extinction reports, and term why samples related to Writers Extinction.
Get Full Essay Get access to this section to get all help you need with your essay and educational issues. The Extinction of Dinosaurs Essay Sample Introduction The Cretaceous Period ended in somewhat what paleontologists see as a catastrophic end to large vertebrates living on Earth during that era.
It was not only the extinction of large vertebrates living on land, sea and air but also of some tropical invertebrates, planktons and some land plants. Though most of the large vertebrates died out, not all of organisms or living things was wiped out. Insects, mammals, birds, and flowering plants on land, and fishes, corals, and mollusks in the ocean went on to diversify tremendously soon after the end of the Cretaceous.
Cowen, There are numerous theories on how and why this extinction had happen, why some were wiped out and why some other organisms thrive. Cowen, Theories about the extinction Until today, theories are still being developed to give light to what happen to the species that died out and how.
There are many stipulations about it ranging from animal parents killing their own egg and asteroids collapsing on the Earth. Asteroid Theory It was stipulated that a massive asteroid struck Earth that forced the like of dinosaurs to extinction.
The theory was that the dust from the collision infuses in the upper atmosphere which in return has caused global darkness. This phenomenon had created imbalance in marine and terrestrial food chains because the darkness had hampered photosynthesis.
This iridium-enriched layer is present at numerous localities in Europe, North America, and the deep sea. Ausich and Lane The chemical changes in the atmosphere brought about by the asteroid struck was suitable for most of the living things at that time because it was assumed that there were high concentrations of sulfuric acid, nitric acid, and fluoride compounds.
Col, It was said that the asteroid would have been about 15 km big and that except for the hampered photosynthesis, the impact may have also caused disasters within the land to happen like big fires, volcanic eruptions and tsunamis. Col, This theory was first presented by Luis and Walter Alvarez in This theory was supported by the Chicxulub crater that could be found at the tip of the Yucatan Peninsula in the Gulf of Mexico.
It is said that this impact may have been the asteroid that caused the extinction of most species at the K-T boundary. The Chicxulub is an impact crater that is mile-wide km1-mile-deep m.
Col, Volcanic Eruption Theory The iridium spike in K-T boundary was assumed to have been because of the basaltic lava eruptions of the Deccan Traps of western India. It was projected that the same kind of Nuclear Winter brought about by the giant meteor impact was caused by the explosive episodes in and the overspill of lava.
It was suggested that this happened when the Indian subcontinent passed over the Chagos Archipelago plume as India drifted north to collide with Asia.
Blanchard Basalt has little trapped gas in it, and tends to erupt non-explosively, rather flowing smoothly, and sometimes nearly continuously creating volcanic fogs. Volcanic fogs are produced when sulfur dioxide, from the basaltic volcanic eruptions, react with water vapor in the atmosphere, which in return produces small aerosols of sulfuric acid.
The volcanic fogs caused by the massive volcanic eruption may have been caused the vegetation to obliterate because the thick fog was blocking the sunlight and also causing water sources to be acidic.
Plants and animals may have died because of this, making living stressful for them. Rowland Recent studies has concluded that another continuous volcanic eruption known as the Siberian Trap may have also contributed to the extinction of dinosaurs and some other species during the Cretaceous Period.
Scientists reasoned that because of the continuous eruption, the planet was getting warmer, which is because of large stores of methane gas frozen on the ocean floor that was released.
Ward, a scientist studying this theory, suggested that the normal atmospheric oxygen level is around 21 percent, but evidence indicates that at the time of the Great Dying it dropped to about 16 percent — the equivalent of trying to breathe at the top of a 14,foot mountain.Extinction of Dinosaurs Two-hundred and thirty million years ago the first dinosaur-like creature roamed the earth.
Dinosaurs were a very successful and diverse group, dominating the terrestrial environments of the earth for million years. Included: expository essay content. Preview text: It is not a secret the ecological situation on our planet is rather complicated.
Apart from the common worries about global warming, industrial pollution, and rain forests being cut down, there is also a huge problem of the extinction of species; and.
extinction theories Two main camps exist in paleontology today, each having a different view of what killed the dinosaurs and other organisms at the K-T boundary. Controversy has surrounded the topic since ; it has become difficult for the public (and the scientific world at large) to understand the issue due to the tangled assemblage of.
Dinosaurs are a diverse group of reptiles. They were the dominant terrestrial vertebrates for over million years, from the late Triassic period (about million years ago) until the end of the Cretaceous period (about 65 million years ago), when the Cretaceous–Tertiary extinction event caused the extinction of most dinosaur species, except for some birds.
The Extinction of the Dinosaurs Many millions of years ago dinosaurs became extinct due to a catastrophic disturbance of the balance of life on earth. Recent studies points to a collision of a meteor on the earth s surface. The extinction of the dinosaurs started in the cretaceous period, around 65 million years ago, and caused the loss of up to 70% of all life on earth.
The way in which the dinosaurs died is a much argued topic which can be explained by a lot of theories one of which is the Asteroid theory.