Question

Volcanic eruptions may last within a few minutes.

Answer 1

Answer:

As magma moves beneath a volcano, this activity creates a swarm of earthquakes that often increase in intensity and strength. Fumaroles, which are fissures that open to vent gases, begin spewing steam, carbon dioxide, sulfur and other poisonous gases. ... Swarms and gas emissions are usually the first stage of an eruption

Answer 2

Answer:

Volcanic activity ranges from emission of gases, non-explosive lava emissions to extremely violent explosive bursts that may last many hours. The types of eruptions determine the relative volumes and types of volcaniclastic material and lava flows, consequently the shapes and sizes of volcanoes.