Volcanoes
A volcano is an opening in the crust where molten rock, ash and gases erupt, often at plate boundaries.
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A volcano is an opening in the crust where molten rock, ash and gases erupt, often at plate boundaries.
- Magma becomes lava on the surface
- Composite volcanoes erupt explosively
- Shield volcanoes have gentle lava flows
🧠 Quick quiz
Three questions. Score 2 or more to complete the topic.
What is Volcanoes?
Within Geography, which covers maps, landforms, weather, climate, population and settlements: understand how our planet and people connect, this topic explains Volcanoes. Geography explains how places, people and natural processes connect, so each topic here combines a clear definition with a visual model.
Check that you can explain Volcanoes in your own words and give one example from everyday life. If you can do that, you have understood the core idea.
Understanding Volcanoes helps you explain patterns on maps and in the news, and make reasoned decisions about places and environments.
Volcanoes in detail
A volcano is an opening in the Earth's crust through which magma, gases and ash erupt. Magma becomes lava on reaching the surface. Composite (strato) volcanoes at destructive boundaries have steep sides and explosive eruptions, with layers of ash and lava, such as Mount Fuji. Shield volcanoes at constructive boundaries or hotspots, such as Hawaii, have gentle slopes and runny lava.
Hazards include lava flows, ash fall, pyroclastic flows, lahars (mudflows) and gases. Volcanoes also bring benefits: fertile soils, geothermal energy, minerals and tourism. Monitoring includes measuring gas, tremors and ground swelling to predict eruptions.
How the interactive helps you understand Volcanoes
Watch the tectonic plates in the interactive. Use any sliders or buttons it offers to change the values and see how the tectonic plates responds.
Before you change anything, predict the result. Then change one value at a time and check whether your prediction was right. This is a quick way to build a correct mental model of Volcanoes.
Real-life uses and examples
- Describe a real place where Volcanoes can be seen, using a map or photograph.
- Explain how Volcanoes affects people, jobs and land use in a region.
- Support an answer about Volcanoes with a named case study and specific evidence.
Common mistakes to avoid
- Writing general statements without a named place or example.
- Mixing up cause, effect and consequence when you explain Volcanoes.
- Learning the definition without testing it. Use the quiz and the interactive to check that you can apply the idea.
Frequently asked questions about Volcanoes
What is Volcanoes?
A volcano is an opening in the crust where molten rock, ash and gases erupt, often at plate boundaries.
What are the most important points about Volcanoes?
The main points are: Magma becomes lava on the surface; Composite volcanoes erupt explosively; Shield volcanoes have gentle lava flows.
Why is Volcanoes useful?
Understanding Volcanoes helps you explain patterns on maps and in the news, and make reasoned decisions about places and environments.
How can I practise Volcanoes?
Open the interactive at the top of this page and change the controls one at a time. Predict the result before each change, then take the three-question quiz. A score of two or more marks the topic as complete on this device.
Which topics are related to Volcanoes?
Related topics in Geography include Fold Mountains, Erosion and Deposition, Drainage Basins.