Breakdown of Тихая зона отделяется от общей зоны.
Questions & Answers about Тихая зона отделяется от общей зоны.
Because it is the grammatical subject of the sentence: the thing being described.
- тихая зона = the quiet zone
- отделяется = is separated / gets separated
- от общей зоны = from the common/general zone
Russian word order is more flexible than English word order, but here the sentence starts with what the speaker wants to talk about first: the quiet zone.
Because the preposition от requires the genitive case.
So:
- dictionary form: общая зона
- after от: от общей зоны
This is very common in Russian: a preposition changes the case of the noun phrase that follows it.
Here, от means from, so от общей зоны literally means from the common/general zone.