Об­ра­зуй­те от слова MASS од­но­ко­рен­ное слово так, чтобы оно грам­ма­ти­че­ски и лек­си­че­ски со­от­вет­ство­ва­ло со­дер­жа­нию тек­ста.

Humans have lived together in cities since ancient times, but even in 1800 urban areas were home to just 3 per cent of the world’s population.

The __________________ explosion of urbanization that accompanied the Industrial Revolution saw that figure rise 15 per cent in the space of 100 years.