While still vacationing in Karpathos, Greece, I frequently visit and swim at the beaches. There are many beautiful things to be found on these beaches, one of them being the geological landscape. The rock formations throughout the years have built incredible cliffs and caves. There are also several beaches in which seashells are embedded into rock. In addition to these special rock formations, another interesting geological find common to Greek beaches is pumice. During each one of my visits to Greece, I have managed to find this light-colored, porous rock at the beach. But exactly how is it made and where does it come from?