Mt. St. Helens Essay, Research Paper
Mt. St. Helens
Top of Volcano Blown Off In Blast! 18/04/82. 60 people were killed
today when Mt. St Helens blew its top
Mt. St Helens erupted two years ago today in a blast that caused the
volcano to be reduced by 451 metres (1313 feet). The volcano is south-western
Washington and is part of the Cascade Range.
Mt. St Helens had been dormant since 1859 and has let off its first
blast since then today. The volcano killed all life in an area of 180 sq. cm(70
sq. miles) including at least 60 people! The ash and dust spread much farther
than this, of course. Today it is continuing to emit to emit dust and ash at
intervals. Today a monument has been erected called the National Volcano
Monument, in memory of this tragedy.
How A Volcano is Formed
A volcano is formed in this way:
1)Magma starts off below the crust.
2)Magma collects in chamber.
3)Pressure rises.
4)The pressure rises so high that the magma breaks through the crust and
volcano erupts.
Often volcanoes are cone shaped. You might ask: “How do they get like that?”
This is the answer:
When a volcano erupts many minerals and fragments are blown up, many
falling in a circle around the volcano. As lava flows onto this it builds up
around the volcano, so the volcano gets higher still. Each time the volcano
erupts, more lava, minerals and fragments are emitted. Therefore every time a
volcano erupts it erupts it gets taller, and some like Mt. St. Helens have even
become tall enough to be classed a mountain.
NB: This article originally contained pictures, elongating it and making
it better presented.
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