What happens during a volcanic eruption? what would you see in the first few minutes, hours, first day, a week later?

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.

Answer any resource, such as wood or solar energy, that can or will be replenished naturally in the course of time;