Which of the following are known as coastlines of submergence?
A
Ria coasts
B
Uplifted lowland
C
Emergent upland
D
Concordant coasts
Correct Answer: Ria coasts
Ria coasts are known as coastlines of submergence. A ria coast is a coastline having several parallel rias separated by prominent ridges, extending a distance inland. The sea level change that caused the submergence of a river valley may be either eustatic (where global sea levels rise), or isostatic(where the local land sinks).