Causes
of eruption
Volcanoes erupt all the time and some times you can
not be perpared for them. Volcanoes erupt deep within the Earth,
it is so hot that some rocks slowly melt and become a thick flowing substance
called magma. Eventually, the magma pushes through the vents and
fissures in the Earth' s surface. That's how an eruption occurs.
The magma that has erupted is called lava. Explosive volcanic eruption
can be deadly and very dangerous.
Signs that an eruptionis likely
Many volcanoes will provide you with warning signs before the eruption actually happens. If you are living near a volcano you may detect premonitory events before the eruption. Seimometers are used to locate and detect earthquakes associated with the rise of magma. Another signal could be swelling in the ground. It can be detected by using precison instruments and techiques.