|The Pumice Island and ash shore from space. Click to Enlarge. Image from NASA.|
Scientists were confused as they could not find a reason for the islands existence. After some investigation it seems that the underwater volcano Havre Seamount erupted and belched out the rock and ash. The island isn't solid so it should not pose trouble to ship traffic. In fact, it is believed that pumice can aid in the replenishment of coral reefs.