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Volcanoes What causes volcanoes? Inside the earth's core there is a red-hot liquid rock, called magma. Are there different types of volcanoes? The type of magma in the earth can create different volcanoes. What effects do volcanoes have? Volcanoes can change the weather. They can cause rain, thunder and lightning. Volcanoes can also have long-term effects on the climate, making the world cooler (see Which volcano has killed the most people?). Can we predict when a volcano is going to erupt? Scientists who specialise in volcanoes are called volcanologists. Which volcano has killed the most people? The volcano eruption in Tambora, Indonesia, in 1815, killed around 92,000 people. More Do volcanoes do anything good? Volcano facts

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