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    Cosmogenic surface exposure dating

    Their flight paths are uniform across the galaxy; they strike the Earth at random orientations.

    Cosmic rays are essentially normal matter that has been accelerated to near light speed by the shock waves produced from supernovae.

    The accelerated particles cause a cascade of interactions in the upper atmosphere as they strike more atmospheric nuclei, creating additional particles and high energy radiation.

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    We observe a pattern of progressively more restricted glaciation during the last five glacial cycles, likely indicating a progressive reduction in the moisture supply necessary to sustain glaciation.The cosmic ray intensity flux also varies with altitude.The secondary particle flux, formed after that first interaction, peaks at 15 km altitude.A hadron is a composite particle made up of quarks held together by a strong force.Hadrons comprise baryons (such as protons and neutrons) and mesons. This component of the cosmic ray cascade is most important for cosmogenic nuclide dating[4].

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