Which one of the following belongs to ocean-continent convergence?

Correct option is C

1. Magmatic Arc:
· Correct.
· Magmatic arcs are formed at ocean-continent convergence zones.
· At these boundaries, the oceanic plate subducts beneath the continental plate due to its higher density.
· The subducting plate melts, producing magma that rises to form volcanic arcs on the continental plate, referred to as magmatic arcs.
· Example: The Andes Mountains along the western edge of South America.
2. Island Arc:
· Incorrect.
· Island arcs are formed at ocean-ocean convergence zones, where one oceanic plate subducts beneath another.
· Example: The Mariana Islands.
3. Suture Zone:
· Incorrect.
· Suture zones are formed during continent-continent convergence, where two continental plates collide, creating mountain ranges like the Himalayas.
4. Mid-Ocean Ridge:
· Incorrect.
· Mid-ocean ridges are formed at divergent plate boundaries, where two tectonic plates move apart, and magma rises to form new oceanic crust.
· Example: The Mid-Atlantic Ridge.
Thus, magmatic arcs are characteristic features of ocean-continent convergence.
Information Booster: 1. Ocean-Continent Convergence Features:
· Formation of a trench at the subduction zone.
· Magma generation leading to volcanic activity.
· Creation of a magmatic arc on the continental plate.
2. Key Examples:
· Magmatic Arc: Andes Mountains (South America).
· Trench: Peru-Chile Trench.
3. Comparison with Other Convergences:
· Ocean-Ocean Convergence: Forms island arcs like the Japanese Archipelago.
· Continent-Continent Convergence: Forms mountain ranges like the Himalayas.
Additional Knowledge: · Subduction Zones:
· Oceanic crust subducts due to its higher density and gets recycled in the mantle.
· Volcanism at Magmatic Arcs:
· Magmatic arcs exhibit explosive volcanism due to the high silica content of magma derived from the subducted plate.
· Mid-Ocean Ridges:
· Associated with seafloor spreading, not subduction, and represent divergent boundaries.