New views on an old planetThis 1994 book provides a historical account of the global change. |
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appear Atlantic atmosphere become began beginning billion years ago bottom called carbon dioxide cause century Chapter circulation climate cold complex continental continents cooling course Cretaceous crust deep deposits direction drift early earth effect environment evidence evolution example exist extinctions Figure flow followed fossils geological geologists glacial gradual groups heat Ice Age icecap important increase isotope land late later latitudes less living magnetic major mantle marine matter means million mountain nature North North America ocean once organisms origin oxygen past perhaps period plants plate Pleistocene pole possible Precambrian present produce range reason record remains result ridge rise rocks salinity sealevel sediments seems separate shallow simple sink species spreading subduction suggest surface tectonics temperature turn University volcanic warm zones