Answer:
The answer is island arc.
Explanation:
A string of islands formed by the volcanoes along a deep-ocean trench is called an island arc.
Island arcs are a curved chain of volcanic islands located at a tectonic plate margin. Sometimes, volcanoes form in the middle of these tectonic plates and its magma rises upward until it erupts on the seafloor, gradually forming islands. Few examples of island arcs are the Japanese islands and the Kuril Islands. This curve shape can be seen from above.