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Scientists have good evidence that Earth is very old, approximately four and one-half billion years old.Scientific measurements such as radiometric dating use the natural radioactivity of certain elements found in rocks to help determine their age.Scientists also use direct evidence from observations of the rock layers themselves to find the relative age of rock layers.Please note that some newer copyrights will require Flash Player 10 be installed for viewing of the online editions.If you do not have this software, please download it from Teachers: If your school or district has purchased print student editions, register now to access the full online version of the book.
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Hebert earned a master’s degree in physics in 1999 from Texas A&M University, where he studied optics and was a Dean’s Graduate Fellow 1995-1996. He has taught at both the high school and university levels.
in 2011 from the University of Texas at Dallas, where his research involved a study of the possible connection between fair-weather atmospheric electricity and weather and climate.
He joined ICR in 2011 as a research associate and focuses much of his work on climates before and after Noah’s Flood, among other research endeavors.
Two possible mechanisms linking cosmic rays to weather and climate.