284 



DEPTHS OF THE OCEAN 



among them vertical oscillations of the water-layers and vortex 

 movements. Many things go to prove that these are phenomena 

 of general occurrence. We must picture to ourselves great 



^Ihi" 





■^^'i© 



v_> 



.y 



-, 11//// 







Fig. 193.— The Currents of the Norwegian Sea. 



submarine waves moving through the water-masses, alterations 

 of depth in the layers according to changes in the velocity of 

 the currents, standing waves, and great vortices. We must 

 further conceive of constant fluctuations in the velocity, pardy 



