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  • Irish Chronicles Document Links Between Volcanoes and Weather
    A study of over 40,000 written entries in Irish Annals and ice core measurements shows a strong corr...Read more

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    Irish Chronicles Document Links Between Volcanoes and Weather

    A study of over 40,000 written entries in Irish Annals and ice core measurements shows a strong correlation between the occurrence of volcanic eruptions and extreme cold weather in Ireland over a 1200 year period. Data analyzed in this study cover the period from 431 to 1649, during which time up to 48 volcanic eruptions are identified in Greenland ice core records through deposition of volcanic sulfate in annual layers of ice. You can find the study (open access), published on 6 June 2013 in IOP Publishing's journal Environmental Research Letters, at http://iopscience.iop.org/1748-9326/8/2/024035/article. Find out more about how volcanoes can influence climate.
  • EF-5 Tornado in El Reno, Oklahoma Widest Ever Recorded in US
    The EF-5 tornado that hit El Reno, Oklahoma on May 31st was the widest ever recorded in the US, acco...Read more

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    EF-5 Tornado in El Reno, Oklahoma Widest Ever Recorded in US

    The EF-5 tornado that hit El Reno, Oklahoma on May 31st was the widest ever recorded in the US, according to the National Weather Service in Norman Oklahoma. The tornado, which remained on the ground for 40 minutes and reached 2.6 miles across (4.2 km), took the lives of 18 people including storm chasers Tim Samaras, Paul Samaras and Carl Young. For more information on the tornado, visit http://ow.ly/i/2hfDG.
  • Atmospheric CO2 Level Tops 400 ppm
    During the week of May 13th, the CO2 level at the Mauna Loa Observatory in Hawaii topped 400 ppm rep...Read more

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    Atmospheric CO2 Level Tops 400 ppm

    During the week of May 13th, the CO2 level at the Mauna Loa Observatory in Hawaii topped 400 ppm repeatedly. Daily levels of CO2 can vary due to weather, and there are seasonal trends as well. The level of atmospheric greenhouse gases continues to increase, now over 120 ppm since the Industrial Revolution began. For more on the Keeling Curve, see http://keelingcurve.ucsd.edu/. Find out more about greenhouse gases and warming.
Sketch based on a drawing from the Florentine Codex, a sixteenth-century colonial manuscript compiled by Fray Bernardino de Sahagun.
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Huitzilopochtli

Huitzilopochtli was the patron deity in Aztec mythology. The Aztecs were an ancient civilization living in Mexico when the Spaniards arrived in 1519 to conquer Central America. Huitzilopochtli, whose name means "Blue Hummingbird on the Left", was the Aztec god of the Sun and the war. Huitzilopochtli was depicted as a blue man fully armed and with his head decorated with hummingbird feathers.

His mother Coatlicue was magically impregnated when a ball of feathers fell into the temple where she was sweeping and came into contact with her breast. This mysterious pregnancy greatly distressed her existing four hundred star children who thought she had disgraced them. One sister of Huitzilopochtli, Coyolxauhqui, instigated her star sisters and brothers to kill their mother, Coatlicue.

However, Huitzilopochtli sprang out of his mother as an adult fully armed and slew Coyolxauhqui and his other star brothers and sisters. Thus, Huitzilopochtli cut off Coyolxauhqui's head and threw it in the sky to become the Moon. Huitzilopochtli was the god who was supposed to guide Aztecs towards a promised land in the South. He incited Aztec people to fight without mercy, to form an empire, and to gather prisoners to sacrifice to the gods.

Aztecs used to offer frequent and numerous human sacrifices to their gods in order to secure rain, harvests and success in war. The victims were usually prisoners captured in the frequent wars that Aztecs were fighting against their neighbors. The most common form of sacrifice was to tear out the heart of a living adult or child and offer it to the Sun.

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The Spring 2011 issue of The Earth Scientist is focused on modernizing seismology education. Thanks to IRIS, you can download this issue for free as a pdf. Print copies are available in our online store.

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