S) why are there no island are or trench structures in the atlantic ocean? what is the significance of an are and trench? oj fig. 4 shows the hawaiian islands with their corresponding ages. what tectonic process is creating the hawaiian seamount chain? why are the scamounts to the nw of hawaii older? 160 157 156°155°154 159 158 kauai(5.1 ma) derma dany 26 ma 1.0 mbroken ma north maui 3.7 ma 1.3 me 0.75 ma 21 lanal (1.28 ma) kahoolawe (1 ma) 20° 19° 0 100 200 kilometers ma = millions of years hawaii (0.5-0 ma) (fig. 4) 7) (6 points) what two plate tectonic processes have contributed to the formation of iceland? 8) how did the andes mountain range in south america form? what type of boundary is this considered to be?