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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.
Mexico’s most dangerous active volcano spewed ash and smoke on Tuesday, with photos showing massive columns of gray emissions – large enough to ground nearby flights.
The volcanic haze contains small quantities of ash, water vapor, sulfur aerosols, and liquid droplets suspended in the air. The main concerns for human health in volcanic haze consist of ash, sulfur dioxide gas (SO 2), and sulfuric acid droplets (H 2 SO 4), which forms when volcanic SO 2 oxidizes in the atmosphere. Volcanic haze can be both an ...
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 ...
In the days since Tonga was struck by a massive underwater volcanic eruption Saturday, a thick layer of volcanic ash remained blanketed over the island nation as new devastating images and details ...
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.
By RYAN GORMAN Recently released images show the stunning moment lightning bolts shot across a massive ash cloud emanating from an Indonesian volcano. The shock lightning occurred nearly one year ...
In particular, although lahars are typically associated with the effects of volcanic activity, lahars can occur even without any current volcanic activity, as long as the conditions are right to cause the collapse and movement of mud originating from existing volcanic ash deposits. Snow and glaciers can melt during periods of mild to hot weather.