How could an island become a seamount?

An island can become a seamount through the process of erosion and subsidence. Over time, natural forces like wave action and weather can erode the land above sea level, while geological processes may cause the island to sink or subside due to tectonic activity. As the island erodes and sinks, its peak may eventually become submerged, transforming it into a seamount—a submerged mountain on the ocean floor.