4691
The area has been volcanically active for millions of years - after South America and Africa were split apart by plate tectonics about 110 " million years ago , West Africa also experienced rifting , although to a lesser degree .
 location: South America; location: Africa; location: West Africa
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 location: South America; location: Africa; location: West Africa