Why Do Volcanoes Erupt?
By The News Voice
A volcano is a rupture in the crust of Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface of Earth.
Now we know what is a volcano. But lets find out why and how do volcanoes actually erupt?
The most common type of eruption is caused by the movement of tectonic plates.
When one is pushed under the other the magma and seawater is forced into the chamber which eventually overflows and the volcano erupts spewing lava into the sky.
Deep within the Earth it is so hot that some rocks slowly melt and become a thick flowing substance called magma. Since it is lighter than the solid rock around it, magma rises and collects in magma chambers.
So what is Magma?
Eventually, some of the magma pushes through vents and fissures to the Earth's surface. So the erupted Magma is called lava. which is hot as 1100 degrees Celsius
Some volcanic eruptions are explosive and others are not. The composition of the magma determines the explosivity of the eruption.
Explosive volcanic eruptions can be dangerous and deadly. They can blast out clouds of hot tephra from the side or top of a volcano.
These fiery clouds race down mountainsides destroying almost everything in their path.
Ash erupted into the sky falls back to Earth like powdery snow. If the ash is thick enough, blankets of ash can suffocate plants, animals, and humans underneath it.
So when the lava from eruption cools down, it forms a new crust. and over time after several eruption, the rock builds up and a volcano is fomred.
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