The greatest concentrations of roman catholics today are found in europe and

The Catholic Church has had its own supremacy since centuries. Catholism dominated in countries which were colonized by Spanish and Portugal mainly.

Roman Catholism is dominant is various parts of Latin America. This is a result of Spanish and Portugese colonies in Latin America and the Roman Catholic missions that accompanied the colonization. Catholism survived even after the end of colonization.

Catholism is also dominant in European countries. Central and other countries in Europe have Roman Catholism as one of the major religions being followed.

since there isn't any suggested answers i will give you the reason and hopefully you can figure it

south africa, or rather all of africa, has not been in the location in which it is nowadays throughout the geological past. after the super-continent pangaea started to break apart, gondwanaland, in which was africa, moved further south, and parts of it came to be very close to the south pole. because the climate in this part of the world is very cold due to the very dispersed sun rays in there, what is now south africa, started to freeze, and the conditions were right for the formation of glaciers. the glaciers existed up until the period when gondwanaland started to break apart and what is now africa started to move towards north, sp it warmed up and the glaciers melted.