Oil shale is a form of sedimentary rock that contains kerogen, which is released as a petroleum-like liquid when the rock is heated. Tar sands are a combination of clay, sand, water and bitumen, which ...

Oil shale is a form of sedimentary rock that contains kerogen, which is released as a petroleum-like liquid when the rock is heated. Tar sands are a combination of clay, sand, water and bitumen, which ...

Oil shale is an inorganic, nonporous sedimentary marlstone rock containing various amounts of solid organic material (known as kerogen) that yields hydrocarbons, along with non-hydrocarbons, and a ...