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The types of minerals present in volcanic ash are dependent on the chemistry of the magma from which it erupted. Considering that the most abundant elements found in silicate magma are silicon and oxygen, the various types of magma (and therefore ash) produced during volcanic eruptions are most commonly explained in terms of their silica content.
volcano: from Latin, referring to volcano; coni: from ancient Greek (κόνις, kónis) which means dust-osis: from ancient Greek, suffix to indicate a medical condition; This word was invented at a meeting of the National Puzzlers' League (N.P.L.) by its president Everett M. Smith.
Augustine Volcano (Alaska) during its eruptive phase on January 24, 2006. A volcano is commonly defined as a vent or fissure in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface.
A volcanic eruption is one of the most powerful forces in nature, a seemingly unstoppable phenomenon that can have far-reaching impacts far beyond the area surrounding the volcano itself. When a ...
Tephrochronology is a geochronological technique that uses discrete layers of tephra—volcanic ash from a single eruption—to create a chronological framework in which paleoenvironmental or archaeological records can be placed. Often, when a volcano explodes, biological organisms are killed and their remains are buried within the tephra layer.
A cinder cone (or scoria cone [1]) is a steep conical hill of loose pyroclastic fragments, such as volcanic clinkers, volcanic ash, or scoria that has been built around a volcanic vent. [2] [3] The pyroclastic fragments are formed by explosive eruptions or lava fountains from a single, typically cylindrical, vent.
Following the volcanic eruption on the Caribbean island of St. Vincent, winds blowing to the east sent clouds of ash over Barbados, located more than 100 miles east of the La Soufrière volcano.
Scientists are monitoring seismic activity, testing the chemical content of ash and probing other metrics that predict volcanic activity. The federal government has mobilized 7,000 troops in case ...