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  • Impact And The Dinosaur Extinction
    452 words
    Theories of the Extinction of the Dinosaurs 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. An opposing theory proposes that the impact of asteroid or comet caused catastrophic destruction o...
  • Earth 65 Million Years
    732 words
    Extinction of Dinosaurs Ryan Humphries Biology 6th Period Two-hundred and thirty million years ago the first dinosaur-like creature roamed the earth. Within five million years it could be considered a dinosaur. They were soon at the top of the food chain. They populated every continent. Then 65 million years ago they vanished. The most powerful creatures ever to live on earth had become extinct. Dinosaurs were not the only victims of this 'mass extinction. ' There were many other species that we...
  • Causes Of Extinction
    601 words
    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 din...
  • Scientists Use To Theories On Events
    787 words
    Humans are curious, like the monkeys we use to be I suppose. By nature have always been fascinated by the past. Many feel that unlocking our past can open doors to the future. Our history is brief in comparison with that of the earth, but yet no claims can be made that we are close to understanding our own human existence, or the roads we took in the past which led us to where we are today. In that light it would be foolish that we could hope to understand what happened on earth before our arriv...
  • Cause Of The Permian Mass Extinction
    10,655 words
    Introduction Earth probably began about 4.5 billion years ago. A history of this life on Earth is recorded in fossil remains and traces of past life. It is a record of evolution for both life and the planet. Life and the planet have co-evolved, with life causing changes to the planet which in turn drive changes in life. The Fossil Record A history of these changes is recorded in the layers or 'strata' of rock laid down over the millions of years, and by changes in the groups of fossils found in ...
  • Walter's Theory Of Mass Extinction
    1,482 words
    T. Rex and the Crater of Doom Walter Alvarez, a geologist, did an amazing job at playing detective in the book T. rex and the Crater of Doom. Though even more amazing is how he was able to convey his account, complete with his inevitable setbacks and occasional victories, in a captivating, suspenseful story. This was a good mystery where the crime was almost perfectly concealed and was full of misleading evidence for the detectives to sort through. Most remarkable and significant was his ability...
  • Permian Mass Extinction As A Result
    1,015 words
    Extinction is, quite literally, the end of a particular evolutionary line, the end of a species, a family, or a larger group of organisms. While it may be bad news for the victims, it's a 'natural' event in the history of life on earth. Extinctions, mostly at the level of species, have been occurring constantly at a low 'background rate', usually matched by the rate at which new species appear - with the result that biodiversity is constantly increasing. But there have been periods in the Earth'...

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