Show THE EARTHS EARTH'S THIN CRUST That the crust of the tle earth is only 40 miles thick thIele and that it must ben when loaded with ocean water ice glacier-ice or deposits of sand or mud Is the opinion of Prof Reginald A. A Daly of Harvard Un Un- The professor advances j I the theory that beneath the surface surface surface sur sur- face crust composed mostly of rock are 1800 miles mlles of glassy rock shells which enclose I the molten core of iron and nickel nicked I I The shifting of weight caused by vast amounts of sediment beIng being be be- I be-I ing carried to sea by rivers is one cause of eath quakes s he believes I for forthe the earths earth's crust must adjust itself itsel to the change of weight Ocean depths dry land and mountains mountains mountains moun moun- are also accounted for bythe by bythe bythe the bending of the earths earth's crust I due to weights I |