In addition to foreign attacks, which internal environmental issue contributed to the Ghana Empire's decline?

A prolonged drought that dried up the Niger River

Overfarming and overuse of the land

A series of major earthquakes that destroyed key cities

The spread of a new disease that affected livestock herds

What was a major economic consequence of the Almoravid invasion of the Ghana Empire?

The discovery of new silver mines in the south

A successful shift from land-based trade to sea-based trade

The disruption of the vital trans-Saharan gold-salt trade routes

The establishment of a new currency based on cowrie shells

The Mali Empire was conquered by the Almoravids, who then founded Ghana.

The Mande people helped the Ghana Empire successfully defend against the Almoravids.

The Ghana Empire declined due to invasions and was eventually replaced by the Mali Empire.

The Almoravids and the Mande people joined forces to create a new, larger empire.