porous lava volcanic rock around around playa de la concha beach in el cotillo

activity alkali atlantic background basalt basaltic beach black canaries canary coast coastal coastline concha cotillo dark destination eroded erosion erupted fields form formation formed fuerteventura fungi geology holiday igneous islands islandsn lava magma morel municipality natural nature north ocean oceanic oliva olivine origin petrography playa porous porphyritic resembling rock rocky sea shore texture textured vesicular volcanic volcanics volcano