Oil shale, which is a convenient umbrella term for a variety of fine-grained and organic-laden sedimentary rocks, is not really oil at all. While it ... are converted to a type of liquid oil that can ...

A compound is a substance that contains two or more elements close elementA pure substance that is made from only one type ... shale, and sandstone are all examples of sedimentary rocks.

Shale is a sedimentary rock made up of tiny grains of silica, clay and other minerals. Many types of rock have few physical ...