A dormant volcano is one that has not erupted for many years, although there is still some activity deep inside.
An extinct volcano has ceased to be active.
A volcanic eruption is when hot rocks and lava burst from a volcano.
Geysers are springs that throw boiling water high in the air. They are caused by volcanic heat warming trapped ground water.
Volcanoes can have a very serious effect on the lands and people around them when they erupt.
- Buildings are destroyed and people are made homeless.
- People are killed.
- Clouds of ash cover plants making them inedible.
- Poisonous gases kill people and animals.
- Dust causes pneumonia and illnesses to the survivors.
- Dark skies, severe winds and heavy rains may follow an eruption for months afterwards.
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