Spesifications of Volcanoes
Even with today’s advanced technologies, it is not easy to predict Natural disasters. Volcanoes are dangerous neighbors because it is impossible to know what to do. Some are completely extinguished. Some are active (like Stromboli Volcano on the Italian coast). However, the most dangerous volcanoes are drowsy. Giant clock they can remain silent for hundreds of thousands of years, like bombs, and then explode suddenly without any signs.
As an Example to Sudden Awakening of a Natural Disaster, For hundreds of years, El Chichon in Mexico was thought to be an extinct volcano. However, the mountain was asleep and he woke up in 1982. Within a few days, three massive explosions occurred and 2,000 people were killed. Explosion, 1 km in diameter left a crater. The lake at the foot of the mountain is still full of gas bubbles leaking from the volcano.
Days before the eruption, the movement of lava in the ground causes small earthquakes and ground shakes. Scientists can predict when these volcanoes will explode by watching these concussions. In the past, these vibrations were monitored by seismographs, which displayed vibrations in a graphical manner. Nowadays, webicorders (a device consisting of internet cameras and seismic devices that transmit real-time images) are used to send alert information via radio and the Internet.
The world’s largest volcanoes produce lava rivers flowing, a hot red river flowing down the hills. This type of lava eruption is very rare, but it is very dangerous when it occurs because it moves very quickly. In 1977, when the volcano of Nyiragongo in Africa erupted, lava flows down the hill at a speed of 60 kilometers per hour.
Natural Disasters may help science too, A scientist dressed in heat-resistant clothing collects lava samples from an active volcano. This is dangerous. In such volcanoes lava is thick and sticky.
Instead of flowing, it accumulates in the mouth of the volcano and exerts increasing pressure until the volcano erupts. During the explosion, a hot lava pellet can be lifted to a height of 1 km in the sky, called a lava bomb.