The correct option is LOESS.
Loess refers to a compacted yellowish deposit of wind blown sediments which is usually found extensively in the mid latitudes. Loess is formed by the accumulation of dust that had been blown by the wind. Scientists believed that about 10% of the earth's land area is covered by loess.<span />
Referring to a particular type of population in a country or area, you are referring to all the people or animals of that type there.
It would be a population density map
Trade and warfare. Trade can increase the countries wealth where war can destabilize a region leading to economic downturns.
