KAMBAEA. 209 



a sink of greater or less depth, according to the length of time during 

 which these processes had been going on. The plateau of both Kainbara 

 and Fulanga runs very rapidly into deep water. The characteristic outline 

 of hat-shaped islands like Wangava is due to the formation of a wide reef 

 platform by submarine erosion and denudation. 



14 



