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The three signs a volcano is about to erupt

A state of emergency has been declared in southern Iceland after another volcanic eruption on the Reykjanes Peninsula - the fourth since December.

But it can be notoriously difficult to know when an explosion might happen, especially when a volcano has been dormant for many years.

However, scientists can look for particular signs and trends to make predictions.

Video produced by Sanjana Bhambhani and Howard Timberlake