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Vol after partos         Volcanos surpass all over the world.The best know vent-hole zones occur on the destructive dental plate permissiveness well-nigh the Pacific Ring of Fire.This chain of volcanos that lie on the westmost coast of central and south America,Japan and the Philippines,across New Zealand and into the Atlantic.Volcanos excessively occur in mid-ocean along the line of ocean ridges.The eastern extend is an example of ocean floor volcanos.When these volcanos erupt lava flows from the cracks expression up the ocean floor.Volcanos can also occur apart from plate boundaries.These atomic number 18 the Hawaiian Volcanos.As you can see there atomic number 18 oodles of places were volcanos occur.Sometimes these volcanos argon where humans have settled.To help cheer our holding and save human lives we have developed slipway to foreshadow when volcanos are about to erupt.Here are some. Predictions         Two of import methods a re used to predict when volcanos are about to erupt.These methods are called geophysical techniques,and chemical techniques. The geophysical method can honor some(prenominal) 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 whole shebang by a pen and a weighting hang up 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 ta ke 2 or more seismographs readings to pin p! oint exactly where the magma is essay to surface.This technique is successful in Hawaii where they are a can 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 dismount to tilt.The tilt can be measured by an performer called a tiltmeter.Two containers are half filled with water.And a thermionic vacuum tube connects the two.As magma rises and changes the a! ngle of the earth.Water goes into... If you want to get a proficient essay, ordinate it on our website: OrderCustomPaper.com

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