What were two reasons the kingdom of ghana eventually fell apart

As in one the previous posts on the Cultural Mosaic, Ghana was rich in gold and power. Other surrounding cities and small empires competed with Ghana in gold trade, but eventually, the competitors caught up. Jealousy(from all the wealth Ghana had), fear(afraid they would conquer their land), and anger of Ghana’s power prompted its neighbors to stand up against the kingdom. Their efforts were at first weak and insignificant, but eventually, in the mid-11th century, a Muslim group known as the Almoravids launched a devastating invasion on the capital city of Koumbi Saleh. Although many territories were taken over, and tribute taxes were enforced, Ghana recovered and forced the invaders to withdraw and get out.

A little less than 200 years later, however, Ghana was not so lucky. Weakened by subsequent and frequent attacks, and cut-off from international trade of salt, gold, and other important things, the kingdom was vulnerable and unable to prevent defeat. In 1240 C.E., Ghana was conquered and absorbed/added into the growing nation of Mali, which would soon become the next great empire.

Another reason Ghana fell from power, was after the attacks, when Ghana was still recovering, a drought came upon them and forced people to move out of the empire to find more food and water.

The answer is challenging and taxing because arduous means when something is hard and tiring and the excerpt provides clear detail why that's the answer