Respuesta :
The natural features served as the northern border for Christian expansion by AD 500 were oceans and rivers.
What is natural features?
Natural features refer to the natural characteristics of the surrounding in which we live. The natural features include god gifted things such as rivers, mountains, plateaus, islands etc.
Some natural features that allowed and made possible the spread of the Christianity were oceans and rivers. Through they travelled far off places in order to discover the routes and also for the trading activities.
Apostles and missionaries spread it. Up until the emperor Constantine converted to Christianity, they were persecuted because they were viewed as a threat.
Therefore, it can be concluded that Natural borders i.e. oceans and rivers acted as the supporter to spread the Christian expansion in A.D.500.
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