The largest city in brazil, sao paulo, has a population of about 11 million. based on the rank-size rule, what is the population of the second-largest city, rio de janeiro, most likely to be? a. 8 – 10 million b. 5 – 6 million c. about 3 million d. about 1 million

The population of Rio de Janeiro is letter B- 5-6 Million. It was officially estimated to be: 6,498,837, which made them the 2nd largest next to Sao Paulo. It is also considered the 41st largest city in the world. It was believed to be because of the increase in immigrates in the earliest time resulted to the drastic change in population growth. 

South wales composes a lot of coal in that region.