Throughout history the rise and fall of civilizations has been propelled by the abundance and scarcity of valued resources. At no time has this been truer than in the 21st century. Whether it is the search for oil or silicon to make microchips or uranium to run power plants, the search is directed by geologists. In this program, the building blocks of this most contemporary science are laid out in a logical order, including the meaning of the fossil record. Spanish subtitles. .