What is the missing reagent? 
Definitions:
Coal
A combustible black or brownish-black sedimentary rock formed from ancient plant matter, used primarily for electricity generation and steel production.
Oil Shale
Sedimentary rock that contains significant amounts of organic material in the form of kerogen, which can be converted into crude oil through heating.
Energy Resource
Any material or phenomenon that can be used directly or converted into other forms of energy to perform work.
Oil And Gas
Natural hydrocarbon resources found beneath the Earth's surface, often used as fuel and in various industrial processes.
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