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The interior of many volcanoes stay hot for a long time. This heat can warm underground water in the vicinity of the volcano. The heated water then reaches the surface to form geysers, fumaroles, bubbling mud pools and hot springs. They also create occurrences of sulphur and other mineral deposits.

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On average, one or two eruptions each year worldwide originate from volcanoes with no previous historical activity or after being dormant for thousands of years. The most violent eruptions occur after long periods of inactivity. Eruptions from these types of volcanoes represent some of the worst natural disasters.

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Volcanic ash clouds can damage aircraft engines but ash is not visible by radar, the main navigation aid for aircraft. There are nine Volcanic Ash Advisory Centres around the world which use satellites to help track volcanic ash clouds and provide warnings for aircraft. The Bureau of Meteorology operates Australia's Ash Advisory Centre.

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Volcanoes can have many different appearances. Some volcanoes are perfect cone shapes while others are deep depressions filled with water. The shape of a volcano provides clues to the type and size of eruption that occurred. Eruption types and sizes depend on what the magma is made up of. Three common volcano forms are:

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How explosive a volcanic eruption is depends on how easily magma can flow or trap gas. If magma is able to trap a large amount of gas, it can produce explosive eruptions

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A volcano is currently active if it is erupting lava, releasing gas or generating seismic activity. An active volcano is labelled dormant if it has not erupted for a long time but could erupt again in the future. When a volcano has been dormant for more than 10 000 years, it is considered extinct. Volcanoes can remain inactive, or dormant, for hundreds or thousands of years before erupting again. During this time, they can become covered by vegetation, making them difficult to identify.

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A volcano is a vent or chimney which transfers molten rock (known as magma) from depth to the Earth's surface through eruptions. Magma erupting from a volcano is called lava. Lava builds up around the vent and forms a cone