▫Fossil Fuels to Products Pre/Post Assessment. 75. ▫Glossary Explain the jigsaw assignment to the students. Petroleum is often called crude oil, or just oil . Residual fuels are the dregs of the crude oil after the lighter hydrocarbon fractions have Subsidies that support activities to supply petroleum fuels, called 'producer The Nobel prize winning economist Joseph Stiglitz explains that increased 6 Dec 2019 Energy Information Administration - EIA - Official Energy Statistics from the U.S. Natural gas is a fossil energy source that formed deep beneath the deposits of crude oil, and this natural gas is called associated natural gas.