This brochure includes a set of facts presented in a popular way. The material can be used for educational purposes: as it is given here or as separate images (by request). More information and contacts: http://app4sea.interreg-npa.eu/ . This work has been done as part of the Arctic Preparedness Platform for Oil Spill and other Environmental Accidents (APP4SEA) project financed by the Northern Periphery and Arctic Programme during 2014-2020.