Ocean current movement can be affected by changes in density use salinity and temperature to explain how ocean currents rise and fall (not tides & waves) from these changes

In a world that produces enough food for every human, why is the distribution of food consumption and production so unequal? in a few sentences, explain why production and consumption of food is lower in the least-development countries (ldcs).

What is the mercury length of time for one revolution around the sun?

How does central place theory explain patterns in the size and distribution of cities?