Determining the exact time dinosaurs went extinct is still problematical because of the reasonable resolution of carbon dating. Second, evidence exists to support a massive terrestrial disturbance at the end of the Cretaceous period that included soot in the air, acid rain, the emission of poisonous gases, and a cooling similar to that of a nuclear winter.
The apparently sudden mass extinction of dinosaurs marks the boundary between the Cretaceous and Tertiary periods. When it hit the Earth it would have formed a crater 60 to 90 miles to km wide. The last theory for the extinction of dinosaurs is a major climatic change.
For instance, in order for the cosmic ray theory to be true, irradiated dinosaur bones would exist. Polar dinosaurs and the question of dinosaur extinction: Because of the set-up of how the Solar System revolves, from time to time it passes by clouds of unusually thick galactic dust, or clouds of hydrogen gas.
If enough radioactive matter was released from the supernova, then plants and animals would have died immediately from radiation sickness. This iridium-enriched layer is present at numerous localities in Europe, North America, and the deep sea.
This shift in plate tectonics would have resulted in a change in climate as well. Blanchard Basalt has little trapped gas in it, and tends to erupt non-explosively, rather flowing smoothly, and sometimes nearly continuously creating volcanic fogs.
One thing is for sure, this extinction changed the course of evolution forever: The Solar System orbits around the center of the Milky Way galaxy. 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.
However, let us take into consideration the truth a life could not be easily extinguished thus the extinction might have happened because of all of it.
We normally find only very small amounts, which come from the tiny meteorites that land on earth all the time.
Many scientists believe this is good evidence for an asteroid, but the case is not proved. This theory was supported by the Chicxulub crater that could be found at the tip of the Yucatan Peninsula in the Gulf of Mexico.
Choose Type of service. Severe competition may have caused over predation and then the predators had nothing to eat and they died in the process as well. Second, scientists disagree on the effect that the dust levels and prolonged darkness had on the various species of the time.
It was said that this might have contributed to the fact that dinosaurs were unable to thrive because they have lost their eggs in the predation cycle. The origin and early radiation of dinosaurs.
Even though these are just small organisms, theses are blood sucking organisms that might have cause big predators like the dinosaurs to lower their immunity thus making them vulnerable to sickness and after a while death.
The massive global fires caused by such an impact would account for the soot found. Bakker who gave the hypothesis that the extinction of dinosaurs may have been because of a plague of epidemic disease.
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. Over a time span of several million years, the volcanic activity could have possibly created enough dust and dirt to prevent sunlight exposure which produced drastic climatic changes.
Marine species died out because their favorite haunts — the shallow seas — dried up and went away. 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.
This brings about global warming because the temperature was heaved by the increasing amount of radiation received by Earth. Though most of the large vertebrates died out, not all of organisms or living things was wiped out.
That the radiation would be fifty times more than the normal radiation that is enough to kill bare lives. Blanchard Egg Predation by Mammals Another theory that was presented about the extinction of species like the dinosaurs was that during the Cretaceous Period, there might have been an overpopulation of species.
It said to happen when the core of a star collapses, where part of the core and outer layers are shot outward creating a huge explosion cloud while some parts of the exploded star creates a black hole as they collapses inward.
The passing of this planet through the Oort causes the disturbance of comets, thus sending many of them crashing to earth. Pages Blanchard, Donald L. One of the dominant signatures of the extinction at the KT boundary was the low activity of primary production, the possibility of reduced sunlight is high Schulte et al.
Severe competition may have caused over predation and then the predators had nothing to eat and they died in the process as well. This thick galactic dust in return falls into the sun, causing the sun to burn intensely and hotter.Evaluative Analysis for Dinosaur Extinction Essay.
Evaluative Analysis for Dinosaur Extinction In Stephen Jay Gould’s article, “Sex, Drugs, Disasters, and the Extinction of Dinosaurs,” Gould begins to analyze the difference between science and speculation. Essays & Papers Dinosaur Extinction Essay - Paper Example Dinosaur Extinction Essay Ever since the history of Earth has been studied using fossil records, extinctions have always been the object of fascination and interest, particularly the mass extinctions that occurred throughout Earth’s history - Dinosaur Extinction Essay introduction.
Theories Of Dinosaur Extinction Essays and Research Papers. Search. Dinosaur Extinction years bistroriviere.com organism has a story, and this is the theory of the dinosaurs extinction KT boundary is a geological signature, usually a thin band, dated.
Theories on Dinosaur Extinction Essay. Theories on Dinosaur Extinction What killed the dinosaurs? Several theories have been brought up over time to answer this question.
It has been of vast interest to many scientists how creatures the size of the dinosaurs could have been wiped out of existence. 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. Was it an asteroid that killed the dinosaurs? 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.Download