[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
News Item: Fifth Worst Mass Extinction Linked to Asteroid Impact
Fifth Worst Mass
Extinction Linked to
They call them the Big Five -- a handful of unfathomable mass
extinctions over the past 500 million years, each
have obliterated somewhere between 50 and 96 percent
species on the planet.
That much we know, because Earth recorded the mass
in layers of ancient soil, where crowds of miniscule
and other evidence show wholesale destruction of the
critters, on which larger animals depend.
What we don't know, except in one case, is what caused
five mass extinctions. Nor is there solid evidence
rapidly the catastrophes occurred.
The balance is at the URL.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Dinosaur Interplanetary Gazette - When you think of dinosaurs, think of
Recommended by National Education Association, Encyclopedia Britannica
Internet Guide, Yahoo and Yahooligans Choice, Netscape Site of the Day.
Member of The Paleo Ring
Bear Bob's Story - Where the first teddy bear really came from....
A prequel to Teefr by Edward Summer
A Yahooligans choice.
Laser Publications, Planetarium Station, Box 502-DIG, NY, NY 10024-0502