Choose the word that BEST matches each definition.
A fossil fuel that occurs in underground deposits, composed of a liquid mixture of hydrocarbons, water and sulfer.
Made from plants and animals used as fuel, especially in a power station for the generation of electricity.
A fossil fuel in a gaseous state.
A solid fossil fue that fo rms underground from partially decomposed plant material.
A source that takes too long to form that it can't be replaced in a lifetime and are formed by geological processes.
Describes how difficult it is to obtain a certain response.
Refined petroleum used as fuel for car and truck engines.
A liquid derived from fossil fuel, especially for use as a fuel or lubricant.
Energy from splitting Uranium atoms to produce electricity.
Energy derived from sources that do not use fossil fuels.