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The eruption which formed the present somma occurred approximately 300,000 years ago. Four large-scale eruptions (Aso 1 – 4) occurred during a period extending from 300,000 to 90,000 years ago. As large amounts of pyroclastic flow and volcanic ash were emitted from the volcanic chamber, a huge depression (caldera) was formed as the chamber ...
The arsenate is an ion with the chemical formula AsO 3− 4. [1] Bonding in arsenate consists of a central arsenic atom, with oxidation state +5, double bonded to one oxygen atom and single bonded to a further three oxygen atoms. [2]
Aso caldera (also known as Asosan, the Aso Volcano or Mount Aso, although the later term usually is used related to its currently active vents) is a geographical feature of Kumamoto Prefecture, Japan. It stretches 25 kilometers north to south and 18 kilometers east to west. The central core "Aso Gogaku" is the five major mountains in the area.
A value of 0 is given for non-explosive eruptions, defined as less than 10,000 m 3 (350,000 cu ft) of tephra ejected; and 8 representing a supervolcanic eruption that can eject 1.0 × 10 12 m 3 (240 cubic miles) of tephra and have a cloud column height of over 20 km (66,000 ft). The scale is logarithmic, with each interval on the scale ...
Also known as Millennium Eruption of Changbaishan Eldgjá eruption, Laki system, Iceland: 934–940 AD: 6: Estimated 18 km 3 (4.3 cu mi) of lava [38] Estimated 219 million tons of sulfur dioxide were emitted [39] Ceboruco, Northwest of the Trans-Mexican Volcanic Belt: 930 AD ±200: 6: 11 km 3 (2.6 cu mi) of tephra [2]
The main factors are pH and the redox potential. Generally, the main forms of arsenic under oxic conditions are H 3 AsO 4, H 2 AsO − 4, HAsO 2− 4, and AsO 3− 4 at pH 2, 2–7, 7–11 and 11, respectively. Under reducing conditions, H 3 AsO 4 is predominant at pH 2–9. Oxidation and reduction affects the migration of arsenic in subsurface ...
An eruption as large as Mount Pinatubo in 1991 could certainly cool the planet for a few years, though it wouldn’t be able to erase the Earth’s current climate woes caused by planet-warming ...
The approximate maximum height of an eruption column is given by the equation. H = k(MΔT) 1/4. Where: k is a constant that depends on various properties, such as atmospheric conditions. M is the mass eruption rate. ΔT is the difference in temperature between the erupting magma and the surrounding atmosphere.