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).

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