Science & Nature

When a Volcano Erupts

A description of what happens before, during and after a volcanic eruption.

B17 min

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1Deep under the ground, rock melts into a hot liquid called magma.

2Pressure builds up slowly until the magma pushes towards the surface.

3When it breaks through, we say that the volcano is erupting.

4Hot lava runs down the sides of the mountain like a river.

5Thick clouds of ash rise high into the sky above the crater.

6Scientists watch volcanoes carefully to warn people who live nearby.

7They measure small earthquakes that happen before an eruption begins.

8Sometimes the lava moves slowly and people have time to escape.

9After the lava cools down, it becomes dark and hard rock.

10Volcanic soil is very rich, so many farmers grow crops on it.

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