How did islam spread across africa?

islam gained momentum during the tenth century in West Africa with the start of the Almoravid dynasty movement on the Senegal River and as rulers and kings embraced Islam.Islam then spread slowly in much of the continent through trade and preaching.  Good luck hipe im right sorry if im wrong!

the andes or andean mountains (spanish: cordillera de los andes) are the longest continental mountain range in the world, forming a continuous highland along the western edge of south america. this range is about 7,000 km (4,300 mi) long, about 200 to 700 km (120 to 430 mi) wide (widest between 18° south and 20° south latitude), and of an average height of about 4,000 m (13,000 ft). the andes extend from north to south through seven south american countries: venezuela, colombia, ecuador, peru, bolivia, chile and argentina.

from wikipedia

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many people believed they were convicted solely because they were anarchists.