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Free research essays on topics related to: mass extinction

9 results found, view free essays on page:

  • Million Years Ago 65 Million Years
    2,114 words
    The "Nemesis Theory" was an outgrowth of the discovery of Alvarez et al. , that the impact of a large (10 km diameter) comet or asteroid was responsible for the great mass extinction that took place 65 million years ago. Studies of the fossil record by Dave Raup and Jack Sepkoski shows that this was not an isolated event, but one of several mass extinctions that appear to occur on a regular 26 million year cycle. Their original paper analyzed marine fossil families, and was published in the Proc...
    Free research essays on topics related to: billion years, solar system, mass extinctions, million years ago, 65 million years
  • The End Permian Mass Extinction
    3,006 words
    Introduction Think of a world which existed 290 million years ago. As you look out over the trade in front of you, you think that you are on an alien planet. You see volcanoes spewing ash and lava. Beside them is the ocean which is swarming with many different species of echinoderms, bryozoans and brachiopods. As you look down onto the sea floor you are amazed at the countless number of starfish and urchins. Some animals leave you can't even describe and you have no idea even what phylum they be...
    Free research essays on topics related to: permian extinction, oceanic crust, ocean basins, marine organisms, mass extinction
  • The End Permian Mass Extinction
    3,001 words
    ... verify the Chinese reports of iridium and they are fruitless. Anomalies can cause a build up of iridium in one place which would lead to what the Chinese have discovered (Erwin, 1993). Cosmic Radiation Global Cooling Global Warming Salinity The hypothesis that salinity decrease caused the mass extinction of oceanic life was first formed by Beurlen in 1956 (Maxwell, 1989). Evidence for this phenomena was based mainly on stenohaline groups such as the bryozoans, ostracods and corals which were...
    Free research essays on topics related to: million years ago, mass extinctions, carbon dioxide, permian extinction, species diversity
  • Ultraviolet Radiation Deadly Virus
    990 words
    Outline I. Introduction Thesis Statement: Is the amphibian disappearances or deformities an early warning of serious environmental problems? II. Origins a. Early b. Evidence III. Habitat a. Ecosystem IV. Indicator a. Detection V. Disappearance a. Arizona VI. Why? a. Diseases b. Pollution VII. Frogs a. Endangered b. Threatened VIII. Conclusion Disappearance of Frogs Amphibian populations are declining or are disappearing around the world. Scientists are impetuously searching for clues as to why t...
    Free research essays on topics related to: deadly virus, million years, mass extinction, early warning, ultraviolet radiation
  • Mass Extinction Earths Surface
    1,021 words
    1. Introduction 2. Body - meteors in popular culture - impacts - Tunguska event - major meteor impacts theory - Chixulub - future impact forecasts, Apophis 3. Conclusion Meteorite Impacts on Earth Meteorite impacts have always affected the Earths history, but only during the second half of the 20 th century astronomers and geologists have found and proved this. The existence of meteorites was not recognized by leading scientists of some 100 years ago. The hypothesis of objects of extraterrestria...
    Free research essays on topics related to: years ago, popular culture, mass extinction, earths surface, climate change
  • Permian Extinction Mass Extinction
    537 words
    The Mother of All Extinctions The article deals with the question that has been argued about by biologists and geologists for many years now. In the history of Earth, there were a number of mass extinction events that left their track in the geological record. This particular article addresses the largest one that ever happened, The Permian extinction which took place about 250 million years ago and destroyed 90 % of all living forms on Earth. Until recent time, the Permian extinction was not so...
    Free research essays on topics related to: collision, mass extinction, permian extinction, great amount, extinction
  • Million Years Ago Mass Extinction
    10,014 words
    Earth probably began Extinction 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 ...
    Free research essays on topics related to: volcanic eruptions, mass extinction, lava flows, permian extinction, million years ago
  • Million Years Ago 65 Million Years
    1,623 words
    The first question that must be posed when trying to crack the mystery of the mass extinction is to ask, throughout history were there any other occurences of this magnitude? The answer is a resounding yes. Altogether over time there has been about eight mass extinctions to large land dwelling vertebrates. The most recent was about ten thousand years ago, killing most of the giant mammals like mammoths, mastodons, super-large camels, saber-toothed tigers, and others (Bakker 428). The second ques...
    Free research essays on topics related to: 65 million years, million years ago, 100 000 years, quot quot, mass extinctions
  • Permian Extinction Mass Extinction
    6,021 words
    The End Permian Mass Extinction Introduction Think of a world which existed 290 million years ago. As you look out over the trade in front of you, you think that you are on an alien planet. You see volcanoes spewing ash and lava. Beside them is the ocean which is swarming with many different species of echinoderms, bryozoans and brachiopods. As you look down onto the sea floor you are amazed at the countless number of starfish and urchins. Some animals leave you can t even describe and you have ...
    Free research essays on topics related to: carbon dioxide, extinction, mass extinction, permian extinction, oceanic crust

9 results found, view free essays on page:

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