Why was the iron curtain a problem?

What name was given to the western european christian church after the religious schism in 1054 ce?

Aman lives on the twelfth floor of an apartment building. every morning he takes the elevator down to the lobby and leaves the building. in the evening, he gets into the elevator, and, if there is someone else in the elevator -- or if it was raining that day -- he goes back to his floor directly. otherwise, he goes to the tenth floor and walks up two flights of stairs to his apartment.

What is the correct def of moif? an idea or object that recurs in a text