CHAPTERS 



y^-' w 



^^ 



-40° 



-139° 



75° 



74» 



73° 



72° 



10 20 30 40 50 60 'O atl 90 [00 STATUTE MILES 



10 20 30 4C W 60 70 60 90 100 ';0 'JO 1 30 I40 1^ KILOMETERS 



10 20 30 40 50 60 70 80 90 [00 NAUTICAL MILES 



FIGURE 8-6A,— Thickness (m) of lower layer. 



177 



