Are coral islands consisting of reefs surrounding a lagoon.

An atoll. An atoll is a ring shaped reef, island or chain of islands formed by coral.

Coral atoll

Explanation:

A coral island is an island that is formed by organic matter and occurs in tropical and subtropical areas. Coral reefs forms around the volcanic hotspots as the ocean undergoes submergence. The atoll is a ring-shaped coral reef that surrounds a lagoon partially or completely. As it forms over the volcanic creator and hence prevents the water from entering the lagoon.

The  franco-prussian  war, a  war  that was  led by prussia a coalition of  german  states, defeated  france. the  war  was the end  of  french  hegemony in europe and resulted in a unified  germany.  i hope this !

Loss of funding i think