VOLCANOES are natural phenomenon that occur every where but some places are more prone than others.The molten rock and gas in the mantle called magma pushes its way up words and pours to the surface through cracks in the crust.This is Volcano.There are different types of Volcanoes.some are explosive ,others are not,and all erupt as spectacularly as we see..Some eruptions takes place unexpectedly ,but others can be predicted , which is very important for the people living near a Volcano.
DIFFERENT TYPES OF VOLCANOES.-IT depends on the matter coming out of the Earth's core.if the magma is more than 1000Centrigrade ,it is dark ,thin and flows quietly .sides of such Volcanoes have gradual slopes.If magma is cold ,then it erupts in explosions .The volcanic cone is steeper .Because of the heat in Earth's core,geysers,solfatars, and hot water sources are found near the volcano.
Volcanoes become dangerous when it cause damage to human life .If a Volcano starts spewing hot gases and gas in a densely populated area many lives are at risk.Explosive volcanic eruptions discharge huge amount of dust and ash ,often burying near by areas .Thin dark magma can flow at a speed of up to 100km/h making it impossible to escape .
Volcanic eruptions can also have far reaching consequences .Some times volcanic ash can reached up to a height of 80 km ,which for some time darkened the sky world wide,as happened in the case of Krakatau volcano erupted in 1883 ,in Indonesia.
VOLCANOES are found primarily,at the border of the plates,where the oceanic Earth's crust submerges below another plate ,melts in the depth and magma rises.This is generally the case all around the pacific ocean.Here the cocos and N Nazca plates submerge below the middle and south America ,and the pacific plate submerge below the small plates in the southeast Asia.Volcanoes are found in areas ranging from Italy to Turkey and Iran up to the Indonesian Islands.Very rarely ,volcanoes are found in the middle of a plate..These occur only in 'hot spots' which are areas of high volcanic activity.,such as the Hawaiian Islands.
PREDICTION OF VOLCANOES.-It is very difficult to predict volcanic eruption .But we can save lives .Early tremors and Earthquake are often signs of a volcanic eruption-gases are emitted and the volcano expands by a centimetres to a metre .The vulcanologist carefully observes these signs .In 1991 ,before the eruption of Pinatubo in Philippines ,these signs were interpreted correctly and over 10,000 people were moved to safer places.Often ,people do not believe the scientist's prediction .In 1985, before the eruption of Nevada Del Ritz in Columbia ,though the danger was predicted very early,the authorities did not react quickly and as a result 25,000 people died.
VOLCANOES
DIFFERENT TYPES OF VOLCANOES.-IT depends on the matter coming out of the Earth's core.if the magma is more than 1000Centrigrade ,it is dark ,thin and flows quietly .sides of such Volcanoes have gradual slopes.If magma is cold ,then it erupts in explosions .The volcanic cone is steeper .Because of the heat in Earth's core,geysers,solfatars, and hot water sources are found near the volcano.
Volcanoes become dangerous when it cause damage to human life .If a Volcano starts spewing hot gases and gas in a densely populated area many lives are at risk.Explosive volcanic eruptions discharge huge amount of dust and ash ,often burying near by areas .Thin dark magma can flow at a speed of up to 100km/h making it impossible to escape .
Volcanic eruptions can also have far reaching consequences .Some times volcanic ash can reached up to a height of 80 km ,which for some time darkened the sky world wide,as happened in the case of Krakatau volcano erupted in 1883 ,in Indonesia.
VOLCANOES are found primarily,at the border of the plates,where the oceanic Earth's crust submerges below another plate ,melts in the depth and magma rises.This is generally the case all around the pacific ocean.Here the cocos and N Nazca plates submerge below the middle and south America ,and the pacific plate submerge below the small plates in the southeast Asia.Volcanoes are found in areas ranging from Italy to Turkey and Iran up to the Indonesian Islands.Very rarely ,volcanoes are found in the middle of a plate..These occur only in 'hot spots' which are areas of high volcanic activity.,such as the Hawaiian Islands.
PREDICTION OF VOLCANOES.-It is very difficult to predict volcanic eruption .But we can save lives .Early tremors and Earthquake are often signs of a volcanic eruption-gases are emitted and the volcano expands by a centimetres to a metre .The vulcanologist carefully observes these signs .In 1991 ,before the eruption of Pinatubo in Philippines ,these signs were interpreted correctly and over 10,000 people were moved to safer places.Often ,people do not believe the scientist's prediction .In 1985, before the eruption of Nevada Del Ritz in Columbia ,though the danger was predicted very early,the authorities did not react quickly and as a result 25,000 people died.
VOLCANOES
Comments
Post a Comment