Black rocks - rather similar in color to gray columnar rocks with a beach of black volcanic sand that shimmers in the sun. Further for a few kilometers stretch of white cliffs. They are also formed by a volcano and consist of pumice. Once, when the volcano erupted, these places were under water. And the lava, saturated with gases and flowing from the bowels of the earth under water, foamed and bubbled, instantly freezing. So pumice deposits were formed under the water, which later rose above the sea, during one of the many earthquakes. Also, a very interesting phenomenon is titanomagnetite sand, whose particles are magnetized to the magnet.
