Find five sewage lakes and five closed lakes on the map.

Wastewater – Baikal, Ladoga, Onega, Verkhnee, Michigan, Victoria, Tanganyika. Endless – Chad, Aral, Caspian, Air, Balkhash.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.