科学家们正在密切监测这座活火山，寻找即将喷发的迹象。

Scientists are closely monitoring the active ___volcano for signs of an imminent eruption.

火山喷发迫使附近几个村庄的居民疏散。

The eruption of the ___volcano forced the evacuation of several nearby villages.

这座岛屿是由一座古老的、现已熄灭的火山形成的。

The island was formed by an ancient, now extinct ___volcano.