1. What is a volcanic activity?
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Volcanic activity ranges from emission of gases, non-explosive lava emissions to extremely violent explosive bursts that may last many hours. ... A volcanic event occurs when there is a sudden or continuing release of energy caused by near-surface or surface magma movement.
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A volcanic eruption occurs when magma is released from a volcano. Volcanic eruptions can be quite calm and effusive, or they can be explosive. Effusive eruptions produce lava flows, while explosive eruptions produce ash and pyroclastic density currents.
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