Answer:
Population, culture, economics and language
Explanation:
The flow of air in a loop caused by differences in temprature and pressure is called <span>Convection</span>
The make money by washing dishes,clothes, etc
I don't know what "this" means here - but Spain, England and Portugal based their empires on their sea explorations and colonizations - all their colonies were not reachable (or only by de-tours) by land.
China, on the other hand was not based on Islands, but connected by land: so here China is the best option.
