The Great Extinction |
Contents
Introduction | 9 |
A Body Has Been Found | 13 |
Clues from the Clays | 24 |
Copyright | |
10 other sections not shown
Common terms and phrases
acid amount animals appeared Atlantic atmosphere became become believed birds body boundary carbon caused clays climate close cloud comet concentrations consider continue cool course crater Cretaceous depends difficult dinosaurs disappeared dust Earth effect elements energy enter entirely environment event example exist explanation extinctions fact fish formed fossils further happened heat human impact important increase iridium kilometres known land larger later layer less living major mammals mass material matter means metals meteorites miles million million years ago move movement natural North object observed occurred ocean orbit organisms osmium oxygen particles particular perhaps period planetesimal plants possible present probably produce radiation reached reason regions remains reptiles rock seems similar soil solar system solid sound species speed suggested suppose surface temperature warm waves