Why do many oceanic volcanoes occur as long lines of volcanoes that are active at only one end? O The lithosphere moves over a stable hotspot in the mantle. The mantle convection cell under the crust carries the magma source from one end of the line of volcanoes t O The mantle plume that feeds the volcano rotates around the Earth's core, tracing new volcanoes as it does O The spreading lithosphere pushes the underlying magma source across the ocean floor. O The active volcanoes are gradually moving away from the oceanic ndge.

The active volcanoes are gradually moving away from the oceanic ridge.

Explanation:

Many oceanic volcanoes occur as long lines of the active end of volcanoes as here in the mid-oceanic ridges the plate is pushed far away from the ridge surface of the earth as these tend to move out in the direction of the movement of the plates. Thus the volcanoes are generally found near the active zones or regions of the tectonic plate and associated with the earthquakes occurring on the fault line or shear lines of the plates. Spreading of the ridges as a result of the seafloor spreading takes place and the mantel and plates from below are the driving forces that make the volcanoes and convection current that rises through the mantle pushes or spread the volcanoes to the sides like seen in the ring of fire.