When does eruption begin?

Eruption typically begins when the pressure from magma builds up within a volcano, causing it to break through the Earth's surface. This can occur due to tectonic activity, such as the movement of tectonic plates or the accumulation of magma in a magma chamber. The specific timing of an eruption can vary widely, depending on geological conditions and the volcano's activity history. Monitoring tools like seismographs and gas emissions help scientists predict when an eruption might start.