Answer:
I didn't understand the question
Located mainly in zones of crustal activity because these zones are often lithospheric plate boundaries
GDP, which we use right now, to see how many people have jobs, at what income, to decide how good the economy is. We could possibly use population density, as poorer countries/less developed countries tend to be more dense all around. Mainly economic things though, so GDP, income per capita. We use life expectancy, rate of literacy, freedom index..hope this helps
Independent Variable is manipulated.
