The correct answer is A. magma
Magma is just lava but when it's inside of the volcano. When it leaves the volcano it becomes lava.
Political geography studies all the following except Economies ( answer A). Political geography is concern with study of both spatially uneven outcome of political processes and the ways in which political processes are themselves affected by spatial structure. It also involve study of boundaries and their associated region.
It is measured With a barometer
Effects of climate change in Durban
These include changes from year to year in water availability, potential damage to infrastructure, threats to biodiversity and ecosystems, impacts on agriculture and food security, higher energy consumption, and health impacts. The urban poor are likely to be the most at risk.