When petroleum is refined it is subject to a number of processes including cracking. During the cracking process w) lighter hydrocarbons are combined to form heavier ones x) heavy hydrocarbons are broken up into lighter ones y) lighter hydrocarbons are separated by distillation z) oxygen is used to burn the heavier hydrocarbons

When petroleum is refined it is subject to a number of processes including cracking. During the cracking process w) lighter hydrocarbons are combined to form heavier ones x) heavy hydrocarbons are broken up into lighter ones y) lighter hydrocarbons are separated by distillation z) oxygen is used to burn the heavier hydrocarbons
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Answer :

ANSWER: X -- HEAVY HYDROCARBONS ARE BROKEN UP INTO LIGHTER ONES
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