Fuel-yielding rock Crossword Clue

The crossword clue "Fuel-yielding rock" with the answer "OILSHALE" refers to a sedimentary rock that contains significant amounts of organic material, primarily kerogen.

When heated, oil shale can be transformed into oil, making it a potential source of hydrocarbons. Its extraction and processing can yield liquid fuels, and it is considered an important alternative energy source in regions rich in this rock type.

The crossword clue "Fuel-yielding rock" with the answer "COAL" refers to a combustible black or brownish-black sedimentary rock that is primarily composed of carbon.

Coal is formed from the remains of ancient plants and is a major source of energy for electricity generation and heating. It has been historically significant as a fuel source and is mined from the earth in various types, including anthracite, bituminous, sub-bituminous, and lignite.

The crossword clue "Fuel-yielding rock" with the answer "LIGNITE" refers to a type of coal that is considered to be the lowest rank of coal due to its relatively low carbon content and energy output.

Lignite is brownish-black in color and is often used in electricity generation, particularly in power plants near lignite deposits. It has a high moisture content, which affects its burning efficiency and energy yield.

The crossword clue "Fuel-yielding rock" with the answer "TARSAND" refers to deposits of sand or sandstone that contain significant amounts of bitumen, a thick, viscous form of crude oil.

Tar sands require special extraction techniques to separate the bitumen from the sand, and once processed, they can yield synthetic crude oil.