Erosion can be cause by only natural causes True or False ?

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This map shows the member states of the european union (eu). based on this map, what is the most likely reason the eu was formed? a) to increase trade between european nations b) to protect themselves from foreign enemies c) to begin the process of forming one large nation d) to isolate europe from the rest of the international community j

Can someone me with this plz? ! i'm putting 20 points on it!