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Hualca Hualca is a 6,025-metre-high (19,767 ft)extinct volcano in theAndes of southern Peru. It is part of the Peruvian segment of theCentral Volcanic Zone, one of severalvolcanic belts in the Andes. It lies about 70 kilometres (43 mi) northwest ofArequipa and is part of a north–south chain that includes the volcanoesAmpato andSabancaya, the last of which has been historically active. Hualca Hualca features a wideamphitheatre-like structure on the northern flank, which was created by a gigantic landslide during thePleistocene. After the collapse, renewed volcanic activity built a new summit and severallava dome complexes within the collapse scar. After the cessation of volcanic activity,glaciers eroded the volcano and formed multiplemoraines. The present-day volcano is covered byglaciers, and during theLast Glacial Maximum, glaciers advanced to low altitudes. There arehot springs andgeysers north of the mountain, and themagma chambers of Sabancaya are located below Hualca Hualca. (Full article...)

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T. D. Bancroft

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On this day

May 4:Youth Day in China;Literary Day in Taiwan;Star Wars Day

Pope Alexander VI

1493 –PopeAlexander VI(pictured) issued thepapal bullInter caetera, establishing a line of demarcation dividing the New World between Spain and Portugal.
1776 –American Revolution: TheColony of Rhode Island and Providence Plantations became the first of theThirteen Colonies to renounce its allegiance to the British Crown.
1942 –World War II: Aircraft fromImperial Japanese Navy vessels attackedAllied naval forces, beginning theBattle of the Coral Sea, the first naval action in which the participating ships never sighted or fired directly at each other.
1974 – An all-female Japanese team reached the summit ofManaslu in theHimalayas, becoming the first women to climb apeak higher than 8,000 metres (26,247 ft) above sea level.
1979 –Margaret Thatcher became the first femaleprime minister of the United Kingdom.

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TheGreensburg tornado was a large and devastatingtornado that moved throughKiowa County, Kansas, on the evening of May 4, 2007, amida tornado outbreak across the central United States, causing catastrophic damage to the town ofGreensburg. The tornado tracked 28.8 miles (46.3 kilometers) through the area, killing at least twelve people and injuring sixty-three others. The tornado was the first to be rated EF5 on theenhanced Fujita scale after the retirement of the originalFujita scale in the United States in 2007. This photograph, taken for theFederal Emergency Management Agency, shows the destroyed town center of Greensburg on May 16, twelve days after the tornado struck.

Photograph credit: Greg Henshall

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