OREANDA-NEWS Scientists conducted a study and said that plastic can be disguised as ordinary pebbles. 

Small pieces, called pyroplastics, are formed when the plastic is heated during production or in certain environmental processes. After a certain period of time, these particles are carbonized and become similar to rock formations carved by the wind and sea water. Experts suggest that such an appearance can elude the attention of specialists. Researchers extracted pyroplastics from the Atlantic beaches in Spain and the Pacific beaches of Vancouver, and stated that they could be widespread. 

Analysis of pyroplastics showed that lead is present in it, followed by chromium. Such a composition is extremely toxic to all living organisms. Thus, experts believe that masking plastic is dangerous, and you need to be careful about pebbles.