Answer:
There is a gradual decline of volcanic age form the continental to the oceanic. As some of the volcanoes get eroded away.
Explanation:
- The hotspot volcanoes are transported by plate movements as they move away form the mantel plumes the hotspot volcanism decreases. Then eventually the hotspots become extinct.
- Thus on the basis of age the youngest are near the places active tectonism where the magma is directly ground underneath the ground surface.
The asthenosphere is weaker and less rigid than the overlying lithosphere.
I've had the same question, the answer is longitude.
Mostly are formed(or carved by water or erosion) side of sea cliffs, Yosemite national park, some of California's lakes,
