nto t ly early in tory and t er. Strengtters. Ricrong of Yale proposed an early-burst t t of ing t agree slybefore at ics in a polemic in an Australian eart cuating myto a report inEarth magazine in 1998.
“ter man,” reported a colleague.
t and part of ter mantle togetone”), s on top of a layer of softer rock called t strengt sucerms are neverentirely satisfactory. to say t ts on top of ts adegree of easy buoyancy t isn’t quite rig is misleading to terials flo only in t glass is. It may not look it, but all tless drag of gravity. Remove a pane of really old glassfrom t iceably t ttom t top. t is t of “floalking about. t ten times faster tle.
ts occur not just laterally as tes move across t upand doion.
Convection as a process deduced by tric Count von Rumford at teentury. Sixty years later an Englislysuggested t terior migents to move about,but t idea took a very long time to gain support.
In about 1970, urmoil came as a considerable s it in t ists decades figuring out tmospropospratosp about wind.”
ion process goes ter of controversy ever since. Somesay it begins four refil “ts of data, from t disciplines,t cannot be reconciled.” Geocs say t certain elements on Eartle, but must h.
terials in tle must at least occasionally mix.
Seismologists insist t to support suchesis.
So all t can be said is t at some sligerminate point as er of Earto pure mantle. Considering t itaccounts for 82 percent of t of its mass, tle doesn’tattract a great deal of attention, largely because t interest Eartists andgeneral readers alike ism) or nearer t to a dept a le consistspredominantly of a type of rock knoite, but ain. According to a Nature report, it seems not to be peridotite. More t know.
Beneatle are ter one. Needless tosay, our understanding of ture of t, but scientists can make somereasonable assumptions. t t ter of tly imes t to turn anyrock tory (among ot t retaining its . Alt is little more t is t t in