Hypotheses on the Extinction of Dinosaurs
In the early nineteen hundreds, dinosaur fossils were discovered and recognized around the globe. Greedy scientists and civilians, searching for their own prize skeleton, rushed to rip bones out of the ground, destroying the fossils as they went. It was not until later in the century that scientists and paleontologists began pondering how such widespread creatures disappeared. Currently, paleontologists debate the two main hypotheses of how the classic dinosaurs died: from volcanic activity or an asteroid impact. Although they result in the same outcome, the volcanic and asteroid hypotheses differ in key elements: the actual event, the environment's stress, and the impact on life.
Physical evidence left behind in each scenario supports each possible explanation for the massive extinction responsible for wiping out the dinosaurs. Scientists that support the volcanic activity hypothesis believe the massive volcanic activity lasted approximately 500,000 years eventually ending dinosaurs reign on earth. The lava flows filled over 480,000 cubic miles, devastating areas over the entire globe. For example, The Decan Trap, a famous site of Cretaceous tectonic activity, is up to 8,000 feet deep, and it averaged between thirty-three and 164 feet deep. Fires raged across the lands. Those that believe in the asteroid impact, on the other hand, project a six mile wide meteorite moved at speeds from 50,000 mph to 150,000 mph and busted into Earth's atmosphere at the end of the Cretaceous Period. The sudden impact near the present day Yucatan Peninsula ejected 5,000 cubic miles of debris into the atmosphere and created an earthquake of magnitude thirteen sending tidal waves, 250 to 300 feet high...
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...sms alike. Conversely, paleontologists backing the asteroid hypothesis guess the massive blast killed nearby animals instantaneously. Creatures on the opposite side of the world, however, were not so lucky. They were forced to dwell in freezing temperatures until vegetation withered. Herbivores quickly starved to death; consequently, carnivores lacked prey. Instead of gradually dying off, dinosaurs perished within one generation. Although the two hypotheses of the great extinction come from opposite occurrences, in the end the event proved fatal.
While paleontologists may never agree on the true cause of dinosaurs' extinction, many people are now speculating mankind's termination. Will mother nature be responsible for our destruction also? Only time will tell. Perhaps in the far future, another species will encounter human remains and search for our match maker.
Youngblood, R. (1973). 20 years in the Secret Service: my life with five presidents. New York: Simon and Schuster.
“...99.9 per cent of all [species] that have ever existed are now extinct.” (Benton 1) After one hundred and sixty million years of domination, the reign of the dinosaurs ended in fire and ice. Sixty five million years ago, the largest volcanoes in the history of the Earth erupted across what is now India, effectively annihilating the dinosaurs by spewing out noxious gas and ash, that effectively blocked out the sun killing off most vegetation and breaking the food chain, leaving the dinosaurs to starve. Compared to other groups of animals the dinosaurs were the most vulnerable to such a climatic event and the result was the end of the dinosaurs’ glorious evolutionary history.
Tobacco companies should be prevented from using advertising tactics that target teenagers. There has always been controversy as to how tobacco companies should prevent using advertising tactics to target teenagers. As controversial as this is tobacco companies shouldn’t advertise teen smoking. Many teens may be lured to believe cigarette advertising because it has been part of the American Culture for years, magazine ads and the media target young people, and these companies receive a drastic increase financially; however, the advertising by these cigarette companies has disadvantages such as having to campaign against their own company, limiting their cigarette advertising and becoming a controversial dilemma as to encouraging teenagers to smoke. From billboards to newspaper advertisements, cigarette promotions started becoming part of the American Culture.
The tobacco industry seems like a beneficial addition to our economy. It has basically been a socially acceptable business in the past because it brings jobs to our people and tax money to the government to redistribute; but consider the cost of tobacco related treatment, mortality and disability- it exceeds the benefit to the producer by two hundred billion dollars US. (4) Tobacco is a very profitable industry determined to grow despite government loss or public health. Its history has demonstrated how money can blind morals like an addiction that is never satisfied. Past lawsuits were mostly unsuccessful because the juries blamed the smoker even though the definition of criminal negligence fits the industry’s acts perfectly. Some may argue for the industry in the name of free enterprise but since they have had such a clear understanding of the dangers of their product it changes the understanding of their business tactics and motives. The success of the industry has merely been a reflection of its immoral practices. These practices have been observed through its use of the media in regards to children, the tests that used underage smokers, the use of revenue to avoid the law, the use of nicotine manipulation and the suppression of research.
The culture of the school should be recognisable when entering the school setting, it should be at all time part of the school and daily practice of the staffs and pupils.
Some paleontologists believe that the global ecosystem had already been on decline before the final blow, an asteroid, destroyed much of life on earth. Continental dr...
“Scientists seek new clues to dinosaur demise.” Geographical v.73 i3, (2001): 10. In InfoTrac Onefile Plus [database online]. Cited 3 April 2004. Available from Ithaca College Libraries.
Culture is an important component when studying a group of people. The idea of culture creates a mental image of how people interact with each other in communities of varying sizes. For educational leaders, throughout the decision-making process, working within the culture of an institution is an important asset for him or her to use with internal and external stakeholders. Craven (1975) infers that in order to make a good decision an educational leader must be in “pursuit of organizational and/or personal goals and objectives” (p. 127). The process of recognizing, respecting, and utilizing the culture of an institution will be a prominent theme of traits and behaviors for effective educational leaders and the decisions they will make throughout their decision-making role.
Lady Macbeth is a dominant character as soon as she is introduced into the play. A.C. Bradley wrote about her as “…the most commanding and perhaps the most awe-inspiring figure that Shakespeare drew” from his article titled Lecture X. She became a image known for her ambitious nature. Her thirst for power and disregard for life was shocking to the audience, as to her own husband. The moment she learns of the prophecies, she decides to stand behind Macbeth and see him to the throne. She is immediately set on her quest for more power. As it reads “Glamis thou art, and Cowador, and shalt be/ What thou art promised (1.5.13-14) This moment is crucial because it is the turning point where Lady Macbeth decides that she might have to kill to fulfill her quest for royalty. Macbeth is doubtful about their plan to kill King Duncan; however, she bombards him with comments that question his courage. She goes as far as telling him his love his worth nothing if he refuses, which proves her to be dominant and controlling using his own weakness against him. His love for her. The fact that she belittles his confidence, insults his abilities, and questions his manhood is so manipulative, but also wise because it worked in her favor. She said to him “Screw your courage to the sticking place” (1.7.60). She was confident that her ridicule could gain her control over her husband. There is no doubt that she manipulates her close relationship to Macbeth to get them both the power they covet.
The most significant event of the Cretaceous era came at its end. Nearly 65 million years ago, the second most severe mass extinction in earth’s history occurred. This resulted in the loss of around 80% of species living at the time. Though nowhere near as severe as the end-Permian mass extinction, the end-Cretaceous extinction is the most well known mass extinction event. This is due to the violent event that caused it the extinction, as well as the chapter of earth’s history that it closed: the Dinosaurs. The Cretaceous Event ( often shortened to K-T event) Of the animals that were killed off were the flying reptiles (pterosaurs) and the last few mosasaurs and plesiosaurs, both early marine reptiles. Many mollusks and species of microscopic plankton were killed. Terrestrial plants suffered mass extinction as well. Almost 60% of terrestrial plants were lost. This led to high extinction rates among insect populations, especially insects that were highly specialized to feed on just a few types of plants had it the worst. It took approximately 9 million years for the global insect populations to recover from the Cretaceous extinction. Immediately after the extinction, the earth saw an explosion of short term species who respond well to fire, or other external disturbance. Evidence of the catastrophe comes from a thin rock layer deposited worldwide just after the impact. It is dominated by fossil plants whose descendants recover quickly after fires of other disturbances, such as Fire Weed in Alaska. The causes of the Cretaceous extinction are still being debated by paleontologists. Scientists agree that the main cause of the extinction was a...
seems like it happened so sudden, as geologic time goes, that almost all the dinosaurs
Should tobacco and alcohol advertising be allowed on television? The ban on advertising tobacco is already in affect, however, alcohol is another harmful substance. Should liquor be allowed to be advertised, if tobacco can not advertise their product? The ban on advertising tobacco products on television and radio, was passed through legislation in 1970 by Richard Nixon. This argument like others out there has two sides, one side in favor these advertisements and the other against these advertisements. Since both of these substances are highly addictive and costly. Would we like to see these advertisements continued? Are these advertisements the hazard they are communicated to be? Through the research of these two important sides, this essay will explore which side has a stronger stance on the topic.
The most popular theory of dinosaur extinction, the asteroid theory, says that dinosaurs died out because of a single, giant asteroid. They say that the asteroid that struck the earth near the Gulf of Mexico went 43,000 mph and spanned six miles wide (Erdman). When it hit the Earth the asteroid it left an enormous crater that measured 24 miles deep and 125 miles wide (Erdman). Just the impact of the asteroid destroyed the forests and landscape of the majority of North America due to its massive shock wave (Erdman). Many species went extinct when the asteroid hit, these species include dinosaurs, ammonites (certain ocean dwelling creatures), pterosaurs, and some plant groups dinosaurs, ammonites (mollusks related to the octopus and the chambered nautilus), pterosaurs, and certain plant groups. Although devastating, the asteroid did not wipe out all of the animals on Earth, it didn’t exterminate fish, frogs, turtles, birds, mammals and croco...
“Culture consists of values, traditions, worldview, and social and political relationships created, shared, and transformed by a group of people bound together by a common history, geographic location, language, social class, religion, or other shared identity” (Nieto & Bode, 2008). Now that we have identified the characteristics of culture in the definition provided above, we can discuss the upbringing of the student I chose for my observation. For this observation, I chose a third grade male student named Israel Oketunmbi. I gathered most of the information about...
According to Gary Phillips, School culture is “beliefs ,attitudes and behaviors that characterize a school in terms of how people treat and feel about each other , the extent to which feel included and appreciated and rituals and traditions reflecting collaboration and collegiality”.