PPT-Mass Extinction

ASTR 1420 Lecture 9 Sections 46 64 113 Mass Extinctions in the Earth History Mass Extinctions Check httpenwikipediaorgwikiImpactevent httpenwikipediaorgwikiMassextinction. The struggle for life on earth. Mass Extinction - Definition. A significant proportion of species become extinct (between 30% and 95%) . The extinctions operate across a wide range of environments and . Overview. Extinctions are as important in the history of life as are the evolution of new species. Explaining extinctions is just as challenging a scientific question as explaining the evolution of new species. AP Environmental Science. Mr. Grant. Lesson . 38. Objectives:. Define . the terms . extinction. , . extirpation. and . mass extinction. .. Contrast . background extinction rates and periods of mass extinction.. The Sixth Mass Extinction. Essential Questions. What is extinction?. Which species have become extinct in modern times? . What are the characteristics of past mass extinctions? . How do modern extinction rates compare with natural (background) rates?. The sixth . m. ass . e. xtinction. Objectives. Define . extinction.. Give examples of (1) past mass extinctions (2) and recent species . extinctions.. Compare current extinction rates with background extinction . CNRS – UNIVERSITE et INSA de Rouen. Outline. of the . presentation. . - Context and objectives. - . Experimental. . set-up. - Transmission, mass . conc. . and size of the . particles. . - the . ASTR 1420. Lecture . 9. Sections : 4.6, 6.4, 11.3. Mass Extinctions in the Earth History. Mass extinction . (a.k.a. extinction event) : is a sharp decrease in the number of species in a relatively short period of time.. Opportunities and. Adaptive Radiations. Overview. Extinctions. Adaptive Radiations—New Niches. Stem mammals survived and experience adaptive radiation.. Evolution of birds, feathers, flight, and flightlessness.. n. Locally and Globally. E. NVR Senior Seminars. Fall 2013. The ENVR Senior Seminar. Defining Species Extinction. Species do not die, only individuals do. With the extinction of a species, no further individuals of that particular living kind will be born. . Topic 2.0 Organizer. . Jose M. Garcia-Oliver. Subtopic 2.3 Coordinators. . Michele Bolla, ETH. Dan Haworth, PSU. Scott Skeen, Sandia. Subtopic 2.3 Contributors. . Experimental. . IFP Energy . nouvelles. Essential Questions. What is extinction?. Which species have become extinct in modern times? . What are the characteristics of past mass extinctions? . How do modern extinction rates compare with natural (background) rates?. Pedro J Marenco. Bryn Mawr College Department of Geology. End . Cretaceous . Mass Extinction. End Permian Mass Extinction. The Big 5 Mass Extinctions. (modified from . Alroy. , 2010). End Permian. End Triassic. Background vs. Mass Extinction. Background extinction. = species gradually and continuously go extinct, creating a turnover of species through time.. Background extinction and mass extinction. 0. 600. Good progress:. Define the term extinction. Explain how extinction may be caused.. Outstanding progress:. Explain that organisms become extinct because something changes and the species cannot adapt quickly enough to the new circumstances..