Curving island chains across the seafloor that are mainly volcanic in origin are called:

A) island acrs
B) sea mounts
C) continental shelves
D) abyssal plains

Island Chains

A series of islands closely spaced in a linear or arc formation, often formed by volcanic activity.

Volcanic Origin

Refers to landscapes, geological features, or materials that have formed as a result of volcanic activity, including eruptions, lava flows, and ash deposits.

Seafloor

The bottom of the ocean, covering a vast area and including features like plains, mountains, and trenches.