Often referred to as the rock that burns, oil shale boasts a high concentration ... Twice in the twentieth century, the federal government encouraged mineral rushes intended to develop oil shale into ...

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

Shale, also called mudstone ... By measuring the radioactive elements, geologists can determine the absolute ages of certain types of rocks and minerals. Rock - A rock is a solid, cohesive aggregate ...

and clearly defined lodes (veins running through rock). Gold, silver, and other minerals that sparked 19th-century mining booms could be relied upon to present themselves in one of these two ways, but ...

Fracking-the high-pressure injection of water, chemicals and sand into shale deposits to release the gas and oil trapped within the rock-in recent years has been combined with horizontal drilling ...