Iron and coal are the two basic ingredients for industrial development.
<u>Explanation:</u>
Only a sufficient provision of energy can bring in industrial development. This energy is generally derived through sources like coal and other fossil fuels.
Coal is consumed more because it is the most efficient and the cheapest of all its fuel alternatives.
Moreover, coal coupled with the availability of iron provides a boost to industrial development by providing firm setups and raw material to the upcoming industries.
convection cells - large wind patterns in Earth's atmosphere caused by convection. Coriolis effect - the bending of currents of air or water due to ...
