Volcanoes 🌋

 There are thousands of volcanoes all over the world. What causes volcanoes? What happens? 

The inside of the earth is very, very hot. It is so hot that the rock has melted. It has become liquid, like water, but much thicker. It is always boiling, like water in kettle. If you have seen a kettle boiling, you know that the steam & boiling water try to get out. The very hot melted rock inside the earth also tries to get out. Usually it cannot cause the outside of the earth is too thick & strong. 

But in some places the outside of the earth is thin & weak. Sometimes a crack appears. The hot melted rock, which we call “ lava”, pushes up through the crack & bursts through. Steam and gas shoot up into the air and the hot melted lava pours out. Big pieces of rock maybe thrown high in to the air. After a while the volcanoes become quite again. The melted lava becomes hard. Later, the same thing happens again & again. So you can see a volcano can stay alive for many years.