An ice core is a core sample that is typically removed from an ice sheet or a high mountain glacier. Since the ice forms from the incremental buildup of annual layers of snow, lower layers are older than upper, and an ice core contains ice formed over a range of years. Cores are drilled with hand augers for shallow holes or powered drills; they can reach depths of over two miles 3. The physical properties of the ice and of material trapped in it can be used to reconstruct the climate over the age range of the core. The proportions of different oxygen and hydrogen isotopes provide information about ancient temperatures , and the air trapped in tiny bubbles can be analysed to determine the level of atmospheric gases such as carbon dioxide.
H.R. 1 tramples speech and election rights to consolidate Democrat power
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Common Era CE is one of the year notations used for the Gregorian calendar and its predecessor, the Julian calendar , the world's most widely used calendar era. The expression has been traced back to , when it first appeared in a book by Johannes Kepler as the Latin : annus aerae nostrae vulgaris year of our common era ,   and to in English as " Vulgar Era". Since the later 20th century, CE and BCE are popular in academic and scientific publications as culturally neutral terms. They are used by others who wish to be sensitive to non-Christians by not explicitly referring to Jesus as " Christ " nor as Dominus "Lord" through use of the other abbreviations. The year numbering system used with Common Era notation was devised by the Christian monk Dionysius Exiguus in the year to replace the Era of Martyrs system, because he did not wish to continue the memory of a tyrant who persecuted Christians. This way of numbering years became more widespread in Europe with its use by Bede in England in Bede also introduced the practice of dating years before what he supposed was the year of birth of Jesus,  and the practice of not using a year zero.
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