volcanoes

An active volcano is one that erupts regularly.

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.