What do we fill the tank with? This student worksheet covers the basic types of fuels and where they originate from - oil and gas formation, crude oil, petroleum refining, the difference between gasoline and diesel fuel, natural gas, ethanol and biodiesel. Short videos (3-9 minutes each) are imbedded in the assignment followed by 2-3 questions on each topic. Great for an environmental science/energy unit or for a mechanical unit where you want students to have a basic understanding of all fue