New Zealand is situated on the Ring of Fire, a geographic belt encircling the Pacific Ocean. This ring contains about 90% of the Earth’s volcanoes.
Volcanoes come in different shapes and sizes. There are three main types found in New Zealand:
Volcanoes erupt when pressure builds up inside the Earth and forces molten rock (magma) towards the surface. New Zealand volcanoes have different levels of activity. White Island is busy all of the time, while some volcanoes can have hundreds, or or even thousands of years between eruptions.
The type of eruption depends on the amount of gases in the magma (which determines the explosiveness) and the silica content (which determines the runniness). Some eruptions are explosive, blowing out great volumes of rocks and molten material. Other volcanoes erupt in flows, pouring out clouds of hot gas mixed with streams of liquid lava.
People living in volcanic regions are at risk from ash, debris and lava flows. For instance, the eruption of Mount Tarawera in 1886 killed around 106 people. When there is a crater lake or torrential rain, water can mix with volcanic debris to form a swiftly-moving avalanche of mud called a lahar. A lahar swept off Mount Ruapehu in 1953 and caused the deaths of 151 people in the Tangiwai railway disaster.
It is important to know what to do before, during and after a volcanic eruption. The most frequent volcanic hazard is ash. It can travel a long way, depending on the wind, and can cause health problems for people and animals and damage buildings and cars. A lot of ash can be very heavy.
Know where active volcanoes are and whether they are likely to affect you.
Have an evacuation plan — where to go and how to get there.
Store water as water supplies may become polluted. Keep your empty water, juice and fizzy drink bottles; give them a good clean and fill them with water — you need three litres of water for each person for at least three days. Don’t forget to store water for babies and pets too.
If you are in a safe place — stay put.
Listen to the radio for information.
Return home only when told to do so.
Find out more about what to do before, during and after a volcanic eruption.
Have you seen the GeoNet volcano cameras? Ask an adult to help you to download an image and then share it with your class.
Make a plan with your family to get through an emergency. Think about the things you need every day and work out what you would do if you didn't have them.
Make your plan — print it out, stick it on the fridge and make sure everyone knows the plan.
Find out about past volcanic activity and eruptions that have happened in your region.
Visit GeoNet to view the volcano cameras and see current volcanic unrest in New Zealand.
Learnz provides virtual field trips. In this field trip, you will see how people live, work and play on the slopes of Mt Ruapehu coping with the risk of volcanic activity.
Learnz provides virtual field trips. In this field trip, experts will take you to remote locations to help you better understand what causes natural disasters such as tsunami, earthquakes and landslides, and how you can manage the risk of these events.
Volcanoes 101 is part of a series of natural disaster videos produced by National Geographic.
Watch this basic introduction to volcanoes, suitable for most ages
A New Zealand perspective on volcanoes from Te Ara, the Encyclopedia of New Zealand.
The Guardian teacher network has resources and ideas for teaching volcanoes.
Watch this video from the Science Learning Hub explaining rock cores.
Earthquakes, floods, landslides, storms, tsunami and volcanic activity can be frightening because they can strike at any time and often without warning. Explore the types of emergencies below and learn better ways to prepare.