Before Present

Before Present

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  • BP and circa in history explained

    YouTube 03:55
  • BC | AD | BCE | BC | BP

    YouTube 03:29
  • Coca-Cola & George the Poet present: Open Like Never Before

    YouTube 02:12
  • Present Perfect (Already, Yet, Ever, Before)

    YouTube 03:31
  • This is the big legendary Toyota car before the present one

    YouTube 03:01
  • The Beauty of Greenland in 4K

    YouTube 02:46

    YouTube 01:59
  • How Does Radiocarbon Dating Work? - Instant Egghead #28

    YouTube 02:11
  • What is Oxalic Acid?

    YouTube 01:39
  • Dendrochronology (Tree Ring Dating)

    YouTube 03:35
  • Carbon-12

    YouTube 02:40
  • Stratigraphy

    YouTube 01:45

Before Present (BP) years is a time scale used mainly in geology and other scientific disciplines to specify when events occurred in the past. Because the "present" time changes, standard practice is to use 1 January 1950 as the commencement date of the age scale, reflecting the origin of practical radiocarbon dating in the 1950s. The abbreviation "BP" has alternatively been interpreted as "Before Physics"; that is, before nuclear weapons testing artificially altered the proportion of the carbon isotopes in the atmosphere, making dating after that time likely to be unreliable.

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