This is the 10788th most frequent Russian word.
вулкана
The Russian word "вулкана" means "of the volcano" (genitive case of "вулкан").
The word 'вулкана' is used in its genitive case to denote possession, describing the eruption associated with the volcano.
Мы наблюдали извержение вулкана в прямом эфире.
We watched the volcano erupt live.
Here, 'вулкана' is in the genitive case, indicating the starting point of the river's flow.
Река течёт из вулкана по склону.
The river flows from the volcano down the slope.
In this sentence, 'вулкана' is in the genitive case because it shows the area associated with the volcano's surroundings.