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According to the ____________________,when a physical or chemical change occurs,no atoms are created or destroyed.
Q4: Which of the following is a type
Q7: Acidic rain,snow,fog,and cloud vapor typically has a
Q8: The second largest volcanic eruption of the
Q14: What proportion of urban Americans live in
Q26: Why do raw materials brought to cities
Q51: Any process that increases or decreases a
Q71: The use of fracking to free oil
Q79: If we are to continue using conventional
Q82: What is the distinct piece of DNA
Q90: Large sections of the earth's crust,called _,slowly