The following five definitions relating to primary care should be taken together. They describe the care provided to the patient, the system of providing such care, the types of physicians whose role in the system is to provide primary care, and the role of other physicians, and non-physicians, in providing such care.
Where The U.S. Gets Its Oil. America is one of the world's largest oil producers, and close to 40 percent of U.S. oil needs are met at home. Most of the imports currently come from five countries: Canada, Saudi Arabia, Mexico, Venezuela and Nigeria.
The U.S. Energy Information Administration (EIA) cannot determine the exact amount of crude oil produced in the United States that is consumed in the United States. However, most of the crude oil produced in the United States is refined in U.S. refineries to make petroleum products. The United States exports small volumes of domestically produced crude oil, most of it to Canada, some of which may actually return to the United States as refined products.