Answer:
7. Declining fertility rate
8. Britain, 18th Century
9. Interest rates were very low.
Explanation: 7. The causes of population ageing vary among countries.
8. It transformed economies that had been based on agriculture and handicrafts into economies based on large-scale industry, mechanized manufacturing, and the factory system. Also introduced Capitalism, Urbanization, exploitation of the working class.
9. Southern European countries also share, as a key feature, a combined and uneven capitalist development.
The core has the largest density, being made of iron and nickel
The mantle has an intermediate density and the crust has the lowest density.
