Which mostly ghana become an empire?

crop rotation kepy different plants in the soil instead of once constintly. when switching out plants you have different nutrients being absorbed at different speeds and different roots growing differently therfore the spoil and water flow have to adapt and carry fresh nutrients to carry the constant changes that were going on in the soil.

explanation:

the president, prime minister, chief justice, speakers and ministers take their oath of office. the oath is taken in bengali