TABLE 3. (Continued) 





Numerical Rating 

 of the Relief 



Side slopes of trough 



3 



Low hills 



3 



Topographic high 



3 



Island shelf 



3,2 



Seamount surface 



3,2 



Irregular topography 



3,2 



Island slope 



2,4 



Seamount surface 



2,3 



Island shelf 



2,3 



Irregular topography 



2,3 



Basin 



2 



Canyon — outer 



2 



Continental slope 



2 



Sill 



2 



Valley 



2 



Rift valley 



2 



Gentle relief (275 meter hills) 



2 



Irregular hills (180 meter relief) 



2 



Intermountain valley 



2 



Abyssal hills 



2 



Gentle topography 



2,1 



Gentle topography 



1,2 



Saddle 





Slope 





Sea valley 





Smooth topography 





Flat topography 





54 



