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 ...

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 ...

Geologists had long known there was oil and gas in the shale rock. But the petroleum wasn’t worth the effort until companies perfected advances in cracking open the dense formations with high ...

Chris Neuzil is a senior scientist with the National Research Program of the US Geological Survey. He has consulted on shale-type rocks for hosting radioactive waste in Switzerland, France, and Canada ...

(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 ...