Which of the following commonly precede a volcanic eruption?

A) Increased gas flow from a volcano
B) Steam eruptions from the volcanic crater
C) Increased heat flow from the volcano
D) All of these

Increased Gas Flow

Refers to a higher rate of gas movement, which can occur naturally or be induced by human activities, affecting environments and processes.

Steam Eruptions

Volcanic eruptions that occur when ground water is heated by magma, turning into steam and causing a violent expulsion of volcanic material.

Heat Flow

Transfer of thermal energy that results when two adjacent masses have different temperatures, especially from depth to Earth’s surface.