Mass Extinction

Rivers in Time: The Search for Clued to Earth's Mass Extinctions by Peter D. Ward,

Several times in the distant past, catastrophic extinctions have swept the Earth, causing more than half of all species -from single-celled organisms to awe-inspiring behemoths -to suddenly vanish mass extinction and be replaced by new life forms. Today the rich diversity of life on the Earth is again in grave danger -and the cause is not a sudden cataclysmic event but rather humankinds devastation of the environment. Is life on our planet teetering on the brink of another mass extinction? In this absorbing new book, acclaimed paleontologist Peter D. Ward answers this daunting question with a resounding yes. Elaborating on mass extinction and updating Wards previous work, "The End of Evolution," "Rivers in Time" delves into his newest discoveries. The book presents the gripping tale of the authors investigations into the history of life mass extinction and death on Earth through a series of expeditions that have brought him ever closer to the truth about mass extinctions, past mass extinction and future. First describing the three previous mass extinctions -those marking the transition from the Permian to the Triassic periods 245 million years ago, the Triassic to the Jurassic 200 million years ago, mass extinction and the Cretaceous to the Tertiary 65 million years ago -Ward assesses the present devastation in which countless species are coming to the end of their evolution at the hand of that wandering, potentially destructive force called "Homo sapiens." The book takes readers to the Philippine Sea, now eerily empty of life, where only a few decades of catching fish by using dynamite have resulted in eviscerated coral reefs -and a dramatic reduction in the marine life the region can support. Ward travels to Canadas Queen Charlotte Islands to investigatethe extinctions that mark the boundary between the Triassic mass extinction and Jurassic periods.
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Holocene extinction event - The Holocene extinction event is a name customarily given to the widespread, ongoing mass extinction of species during the modern Holocene epoch. The extinctions vary from mammoths to dodos, to countless species in the rainforest dying every year.

Ecological collapse - Ecological Collapse refers to a situation where an ecosystem suffers a drastic, if not permanent, reduction in carrying capacity for all organisms, often resulting in mass extinction. Usually, an ecological collapse can be precipitated by a disastrous event occurring on a small time scale, such as the Cretaceous-Tertiary extinction event which was an ecological collapse widely believed to be caused by an impact event.

Alvarez hypothesis - The Alvarez hypothesis is the theory that the mass extinction of the dinosaurs and many other living things was caused by the impact of a large asteroid on the Earth sixty-five million years ago, called the Cretaceous-Tertiary extinction event. Evidence indicates that the asteroid fell in the Yucatán ...

Atomic mass - The atomic mass of a chemical element is the mass of an atom at rest, most often expressed in unified atomic mass units. The atomic mass is often synonymous with relative atomic mass, average atomic mass and atomic weight; however, it is subtly different in that it can either be the ...

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