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Petroleum is a fossil fuel containing many different carbon compounds. If the carbon atoms in petroleum have been in the ground for 100 million years, what fraction of the initial 14C atoms is still there? (t1/2 = 5,370 yr)
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Customs, beliefs, or practices passed down through generations within a culture or society.
Religion
A set of beliefs regarding the cause, nature, and purpose of the universe, especially when considered as the creation of a superhuman agency or agencies, often involving devotional and ritual observances.
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A system of rules created and enforced through social or governmental institutions to regulate behavior.
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The process of arranging or dealing with tasks, problems, or items in order of importance.
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