What natural riches of Russia does Marco Polo pay attention to?

Natural resources: furs (ermine: sable, squirrel, fox, erkolin), silver ores, birds (gyrfalcon and pilgrim falcon).

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.