Consider the following statements about island arcs
(A) They have their convex sides directed towards the ocean
(B) They form a line of active or recently extinct volcanoes
(C) They coincide with a belt of positive gravity anomalies
(D) Deep-focus earthquakes occur beneath the continental side if the island arcs.
Sir,Given answer ::A,B,D.
I can understand D,and B.But Can't get option A.
also Why C.is not true? How A is true?