Volcanos         Volcanos surpass all over the world.The best know venthole zones occur on the destructive dental plate margin well-nigh the Pacific Ring of Fire.This chain of volcanos that lie along the westmost coast of central and south America,Japan and the Philippines,across New Zealand and into the Atlantic.Volcanos also occur in mid-ocean along the line of ocean ridges.The Mid-Atlantic extend is an example of ocean floor volcanos.When these volcanos erupt lava flows from the cracks building up the ocean floor.Volcanos can also occur away from plate boundaries.These atomic number 18 the Hawaiian Volcanos.As you can see there atomic number 18 lots of places were volcanos occur.Sometimes these volcanos are where humans have settled.To help cheer our belongings and save human lives we have developed slipway to predict when volcanos are about to erupt.Here are some.
Predictions         Two of import methods are used to predict when volcanos are about to erupt.These methods are called geophysical techniques,and chemical techniques.
The geophysical method can honor any changes in the rock below.As the magma rises it forces the rocks apart,Which can create minor earthquakes on and or around the mountain.These can be sight on a seismographs.A seismograph picks up the seismic waves the earthquake gives finish and records them.A seismograph works by a pen and a weighting suspended on a spring.As the earth shakes the pen writes the waves,called a seismogram,on a revolving drum.A comparison can be used.
They take 2 or more seismographs readings to pin point exactly where the magma is essay to surface.This technique is successful in Hawaii where they are a lot of volcanos.The place and the time of eruptions have been forecast accurately.Before a volcano is about to explode the desktop around it swells with magma.This causes the ground to start to tilt.The tilt can be measured by an instrument called a tiltmeter.Two containers are half filled with water.And a tube connects the two.As magma rises and changes the a! ngle of the earth.Water goes into...
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