The Cerro Blanco is a caldera in the Andes, located in Argentina's Catamarca Province. Part of the Andes Central Volcanic Zone, it is a volcano collapse structure located at an altitude of 4,670 metres (15,320 ft) in a depression. It has been active for the last eight million years and its eruptions have created several ignimbrites. An eruption 73,000 years ago formed the Campo de la Piedra Pómez ignimbrite layer, while another eruption in 2,300 ± 160 BCE became the largest volcanic eruption of the Central Andes, and reached the highest level in the Volcanic Explosivity Index, ejecting an estimated 170 cubic kilometres (41 cu mi) of tephra. This eruption led to the formation of the most recent caldera, as well as thick ignimbrite layers. However, the Cerro Blanco has been dormant since then, although some deformation and geothermal activity have been recorded. The volcano is also known for giant ripple marks that have formed on its ignimbrite fields.

Read more: https://en.wikipedia.org/wiki/Cerro_Blanco_%28volcano%29

_______________________________ Today's selected anniversaries:

1789:

The Power of Sympathy by William Hill Brown, widely considered to be the first American novel, was published. https://en.wikipedia.org/wiki/The_Power_of_Sympathy

1919:

The First Dáil (members pictured) convened at the Mansion House in Dublin and adopted a declaration of independence calling for the establishment of the Irish Republic. https://en.wikipedia.org/wiki/First_D%C3%A1il

1972:

Tripura, formerly part of the independent Twipra Kingdom, became a state of India. https://en.wikipedia.org/wiki/Tripura

2017:

Millions of people participated in the worldwide Women's March, to advocate for legislation and policies on human rights and other issues. https://en.wikipedia.org/wiki/2017_Women%27s_March

_____________________________ Wiktionary's word of the day:

cold weapon: (weaponry) A weapon that does not use explosives or fire. https://en.wiktionary.org/wiki/cold_weapon

___________________________ Wikiquote quote of the day:

Ladies and gentlemen, this is a crucial moment.  Russia is regrouping, recruiting, and trying to re-equip.  This is not a moment to slow down. It's a time to dig deeper. The Ukrainian people are watching us. The Kremlin is watching us. And history is watching us.  So we won't let up. And we won't waver in our determination to help Ukraine defend itself from Russia's imperial aggression.   --Lloyd Austin https://en.wikiquote.org/wiki/Lloyd_Austin