There are a lot of hot substances inside the earth. Sometimes these substances go up to the surface and they come out trough volcanos.
The substances that the volcano expells can be solid, like ash. They can also be liquid like lava. Volcanos expel gases that can cause explosion inside the volcano.
Also sometimes volcanic eruptions can create islands such as Hawaii.
Sometimes their eruption can be very strong that can disappears city such as Pompeii.
We think volcanic eruptions are natural disasters that we can't control, but we know what to do in case of a volcanic eruption.
By Daniela Cabrera Chávez and Sebastian Farías Galvan