For more than a century, shale and other sedimentary rocks containing a significant portion of solid waxy kerogens have been known as oil shale. When heated, the kerogens are converted to a type of ...

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

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.

Mudstone, shale, and limestone are examples of sedimentary rock likely ... Throughout the earth's history, each of the three rock types has been continuously formed and recycled into other types of ...

Two recent projects are testing and proving that shale technology can be adapted to extract energy from hot rocks deep underground ... commercialization of this type of geothermal energy.

(See interactive: "Breaking Fuel from the Rock") "Natural ... policies of the type and stringency simulated here there is no market for these technologies, and the shale gas reduces interest ...