For electricity and for transportation.
Transportation and trade.
There is only one inland sea in Europe: the Caspian Sea. Many mistake the Black Sea for being an inland sea, but in fact, it is connected to the Mediterranean Sea.
There are three.... Suez canal; Straits of Gibraltar & the Bosporus, to & from thre Black Sea.
The North Sea and the Mediterranean Sea.
North Sea and Mediterranean Sea
The two continents that border the Black Sea are Asia and Europe. The Black Sea is wedged in between these two continents.
The two continents are Europe and Africa.
the seas that border Europe is the black sea the Aegean sea the Mediterranean sea the north sea the Celtic sea and the Baltic sea.
North Africa and Europe are separated by the Mediterranean Sea.
Caspian sea and black sea
the Mediterranean Sea and the black sea.
the red sea separates the two
I'd have to say Christianity for certain and with the rise of Islam, then Islam is number two.