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This is the second in a three part podcast series on testing your knowledge about carbon.  Earth has many processes that regulate carbon, atmospheric carbon dioxide and its role in the carbon cycle and climate.  How much do you know?  In this podcast we will look at questions 4 - 7, from the quiz.  If you would like to visit the entire quiz online, please visit:http://climate.nasa.gov/quizzes/carbon-quiz

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