Volcanic eruptions is an event that occurs due to deposition in the bowels of the earth's magma is pushed out by a high-pressure gas.
Magma is incandescent fluid contained within the layers of the earth with a very high temperature, which is estimated at more than 1,000 ° C. Liquid magma that comes out of the earth is called lava. Temperatures could reach the lava issued 700-1200 ° C. Volcanic eruptions that brought rock and ash can gush as far as the radius of 18 km or more, while the lava could overwhelm the extent radius of 90 km.
Not all volcanoes erupt frequently. The volcano erupts frequently called an active volcano.
Volcano will erupt can be known through some signs, among others:
- Temperatures around the mountain riding.
- Springs into dry
- Often issued a roar, sometimes accompanied by vibration (earthquake)
- Wilted plants around the mountain
- Animals migrate around the mountain
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