Extinction On Dinosaurs

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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

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