Theories of the Extinctions of the Dionsaurs:
Dinosaurs became extincted 65 million years ago, at the end of the
Cretaceous period, something so devastating that it altered the course of life on earth. It
seems like it happened so sudden, as geologic time goes, that almost all the dinosaurs
living on earth disappeared. So how did these dominant creatures just die off? Was it a
slow extinction, or did it happen all of the sudden? These questions bring rise to many
different beliefs on how the dinosaur disappeared over 65 million years ago.
Extinction is when the birth rate fails to keep up with the death rate, it is
called extinction. But, the definition does not answer the question about the nature or
causes of extinction. Paleontologists generally divide extinctions into two types, for that
of different causes arose. The first is called background extinctions, isolated extinctions
of species due to a variety of causes. Included is out competition, depletion of resources
in a habitat, changes in climate, the development or destruction of a mountain range, river
channel migration, the eruption of a volcano, the drying of a lake, or the destruction of a
forest, grassland, or wetland habitat. The second type of extinction is called mass
extinctions. Large numbers of species go extinct; many types of species go extinct; the
effects must be global, and the effects must occur in a geologically short period of time.1
The dinosaur could not have lived for ever. No creatures, no plants, no tiny bacteria are
forever, not even Homo sapiens. Extinction is the fate of all species. One theory on how
the dinosaurs became extinct is that of carbon dioxide, and the greenhouse effect.
Volcanoes produced the proposed conditions. A massive volcanic eruption could have
saturated the atmosphere with carbon dioxide so that it caused a sharp rise in
temperatures worldwide. The excessive carbon dioxide would have permitted solar
energy to enter the atmosphere but would have blocked the radiation of most surface heat
back out into space, therefore causing the greenhouse effect. Rising temperatures could
have killed off or reduced the activity of plankton, disrupting food chains and also
messing up the plankton's normal role in converting carbon dioxide to oxygen through
photosynthesis. From there it would not have been long for all the dinosaurs to have been
suffering, and then to become extinct.
My theory of the extinction of the dinosaurs is the theory of the comet
[7] Klug, W., Cummings, M., Spencer, C., Palladino M. (2012) Concepts of Genetics: Tenth Edition. Pearson's Education, Inc.
The Civil Rights Movement in the 1950’s and 1960’s was a mass mobilization and unification of people from varying backgrounds fighting for equal rights and equal opportunity for Black Americans. Black male leaders such as Martin Luther King Jr. preached about equality and challenged people to consider social injustices within society. The leadership qualities and influence of Dr. King are undeniable. His rhetoric united Black America and identified their entitlement to the principles embodied in the Declaration of Independence and Constitution. Dr. King’s inspiring speech for Black’s to “one day live in a nation where they will not be judged by the color of their skin, but by the content of their character”, motivated White and Black
The Permian-Triassic extinction event is undoubtedly the largest extinction event the Earth has ever seen. While evidence shows that it occurred over a great amount of time, it was effective in causing the extinction of an incredibly large portion of life on Earth. To such an extent that it took millions of years before any large amounts of biodiversity occurred again. This is why it is also referred to as the ‘Great Dying’.
We use dinosaurs to represent the changes in nature that have occurred throughout time. Studies found that although the “oldest rock did not show evidence of life, the progression of plant and animal life that changed in recognizable intervals, from ancient life, age of reptiles to the age of mammals” (Dino Nature Metaphor, slide 6), measured the age of the earth. When we think of dinosaurs in relation to nature, we think of that very powerful force that controls the cycle of life. Nature was able to yield such magnificent ferocious creatures that walked the earth and then take them back when they served nature’s purpose. Dinosaurs fit perfectly in nature’s constant
Controversy surrounds the extinction of the dinosaurs. According to one theory, dinosaurs were slowly driven to extinction by environmental changes linked to the creeping withdrawal of shallow seas from the continents at the end of the dinosaur era. Proponents of this theory propose that dinosaurs dwindled in number and variety over several million years.
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.
Have you ever had those moments where you are feeling unmotivated or zero energy to workout? I will be the first to tell you I have had these moments. Being involved in the fitness world, I love every aspect of fitness. For the past 5 years, I was working out 5 days a week and had my ups and downs with results. I am guilty of it, I would pick up a workout magazine and try out this crazy workout and just destroy my body. Sure, I saw some results but I was becoming more and more tired throughout the day. On top of that, I was only getting 5 hours of sleep and not eating appropriately to refuel my body. I know stupid right? I am human and I am not perfect!
Pimm, Stuart “Opinion: The Case of Species Revival”, news.nationalgeographic.com, 13 March 2013, 20 May 2014
...pdated 1995, accessed 3 Sept. 2000), Dino Buzz – What killed The Dinosaurs ? – Current Arguments,
What happened to the dinosaurs? Why did they disappear? Dinosaurs roamed this earth from around 231 million years ago to 66 million years ago; that’s 170 million years of existence! Some event must have happened to wipe out these prehistoric animals. Many scientists believe an asteroid impact was responsible for the dinosaurs demise.
It could have been a comet or an asteroid that hit the dinosaurs and ended the life of dinosaurs. If a comet's killed them it will not happen in an fast time lapse
...a faster rate than ever. Data from graphs evidently prove this theory. From the graph the greatest leap of extinction is seen 1920s till now. This trend line is drastically increasing (figure 4). Experts say that approximately half of the world’s current species will be entirely gone by the end of the century, hence proving that we are in the middle of an anthropogenic mass extinction.
One of the big causes of extinction or the endangerment of species is foreign species entering a habitat. This species that are not native to the land can disrupt the food web in that community. These species take control of the food web and endanger some of the other species. The native species become endangered and over the course of many years they either adapt to their new way or life, the foreign predator leaves or is killed off due to the different environment, or the species is killed off and becomes extinct. Organizations like the “World Wild Li...
could go extinct with the way the climate is going (Roach, 2004). When many different kinds