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Volcanos Essay

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VOLCANO
A volcano is a mountain or hill formed by the accumulation of materials erupted through one or more openings in the earth's surface. Most volcanoes have steep sides but sometimes ...
Volcanos occur all over the world.The best know volcano zones occur on the destructive plate margin around the Pacific Ring of Fire.This chain of volcanos that lie along the west 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 Ridge is an example of ocean floor volcanos.When these volcanos erupt lava flows from the cracks building up the ocean
Volcanoes
Volcanoes JACK KNOFF WR 327 Technical Report Spring '99 Introduction In this report I plan to discuss the geological event of volcanic eruptions and the disasters they cause. To me, ...
floor.Volcanos can also occur away from plate boundaries.These are the Hawaiian Volcanos.As you can see there are lots of places were volcanos occur.Sometimes these volcanos are where humans have settled.To help protect our belongings and save human lives we have developed ways to predict when volcanos are about to erupt.Here are some. Predictions Two main methods are used to predict when volcanos are about to erupt.These methods are called geophysical techniques,and chemical techniques.
A Look Into Volcanoes
I. Introduction Volcano: defined is a mountain ...
The geophysical method can detect 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 detected on a seismographs.A seismograph picks up the seismic waves the earthquake gives off and records them.A seismograph works by a pen and a weight suspended on a spring.As the earth shakes the pen writes the waves,called a seismogram,on a revolving drum.A comparison
A Look Into Volcanoes
I. Introduction Volcano: defined is a mountain or hill formed by the accumulation of materials erupted through one or more openings (called volcanic vents) in the earth's surface. The term ...
can be used.They take two or more seismographs readings to pin point exactly where the magma is trying 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 ground 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
Volcano Facts
Hot! Fire! Destruction! These are words that most people associate with volcanoes. But some good effects can come out of volcanoes. Volcanoes also ...
filled with water.And a tube connects the two.As magma rises and changes the a! ngle of the earth.Water goes into the lower container.Scientist can tell if the volcano is getting more active.When magma moves its gravity changes.This change in gravity can be detected by using gravimeters.When rock is heated to a certain temperature.It looses its magnetism.And this can be detected with a magnetometer.When magma rises to the surface it gives off heat.This heat can be detected with
Volcano
VOLCANOES Volcanoes are holes or vents in the Earth s crust, created when molten hot magma under the crust of the Earth is forced upward to the surface. Magma ...
a intfa-red temperature surveys.Sometimes chemical methods are used.They measure the volcanic gases at hit springs and at fumaroles which are openings in the ground were gases escape from.Just before a volcano is about to erupt there is an increase in certain gases.These gases are chlorine compounds,sulphor oxides,carbon dioxide,hydrogen, and radon. Damages When a volcano erupts huge amounts of lava are spewed out of the volcano.These huge flows of lava can wipe out towns.This type
Volcanoes
Volcanoes What is a Volcano? The scientific definition of a volcano is a geological landform, consisting of a fissure in the earth s crust, above which a cone of volcanic ...
of volcanic eruption is called Hawaiian.These volcanos put on fire shows .They are rarely violent or explosive ,because the lava is fluid enough to let the gases escape easily.The lava flows out of boccas.These volcanos are not really dangerous.But they can cause alot of damage if people or buildings get in its way.A strombolian eruptions are more violent producing a lot thicker lava.Because the lava is thicker the gas can not escape easily from it making
Volcanoes
VOLCANOES The city of St. Pierre on the French Caribbean Island of Martinique had been living in the shadow of their volcano for more than two centuries and it had ...
the lava hostile.The plinain eruptions ar the most dangerous .They hurl huge amounts of pumice as high as fifty kilometers into the atmosphere.Then is ash falls over wide areas.Then this is followed by pyoclastic flows,where hot gases and ash pour out of the vent.These flows rush across the landscape ,burning and burying anything in its path.This is the eruption that happened to Mount St.
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