The Earth's crust, on which we live and depend on, is in large part the product of millions of once-active volcanoes and tremendous volumes of magma that did not erupt but instead cooled below the surface. For example, volcanic ash blown over thousands of square kilometres of land increases soil fertility for forests and agriculture by adding nutrients and acting as a mulch. Groundwater heated by large, still-hot magma bodies can be tapped for geothermal energy. And over many thousands of years, heated groundwater has concentrated valuable materials including copper, tin, gold, and silver, into deposits that are mined throughout the world. Therefore the benefits of living near the volcano outweigh the costs.

Mining claims for copper, gold, and silver were staked in the St. Helens mining district north of the volcano as early as 1892. ... Mining fever broke out about 1900, and hundreds of claims were staked in the Spirit Lake area as prospectors sought high-grade vein deposits. About 14 tons of copper ore from the Sweden Mine were hauled to a Tacoma smelter in 1905 and used to cast the bronze statue of Sacajawea for the Lewis and Clark Exposition held in Portland, Oregon.

Another benefit is that People use volcanic products as building or road-building materials, also as abrasive and cleaning agents, and as raw materials for many chemical and industrial uses.some of these were used to construct walls in indonesia Most of the metallic minerals mined in the world, such as copper, gold, silver, lead, and zinc, are associated with magmas found deep within the roots of extinct volcanoes located above subduction zones

during late March to mid-May 1980, Mount St. Helens was shaken by hundreds of earthquakes, intermittently erupted ash and debris derived by steam blast reaming out of its preexisting summit dome, and experienced extremely large and rapid deformation caused by magma intrusion.this eruption was one of the most watched and reported in history. The hot intruding magma provided the thermal energy to heat groundwater, which explosively flashed to generate and sustain the observed steam-blast eruptions. For 2 months the volcano was literally being wedged apart, creating a highly unstable and dangerous situation. The eventual collapse of the bulge on the north fl

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Approximate Word count = 1059
Approximate Pages = 4 (250 words per page double spaced)