Answer:
Many refineries are located close to crude oil production centers such as the Gulf Coast
Explanation:
Many refineries are located close to crude oil production centers such as the Gulf Coast (which has significant volumes of crude oil produced both onshore and offshore); near destinations for importing crude oil; or near major population centers where much of the refineries' output will be needed (e.g., California and the areas near Philadelphia, New York City, and Chicago).
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