Joseph P. Riva
Contributor
LOCATION: United States
Specialist in Earth Sciences (geologist), Congressional Research Service, Library of Congress, Washington, D.C. Author of World Petroleum Resources and Reserves and others.
Primary Contributions (4)
Petroleum, complex mixture of hydrocarbons that occur in Earth in liquid, gaseous, or solid form. A natural resource, petroleum is most often conceived of in its liquid form, commonly called crude oil, but, as a technical term, petroleum also refers to natural gas and the viscous or solid form…
READ MORE