Studying the distribution of certain elements, present in very low concentrations in igneous and metamorphic rocks, can yield important clues about the rocks' origin and evolution.
Denis M. Shaw
Charles Darwin
Philip David Zelazo
Marcus J. Kurtz
John Christman
Marina Frasca-Spada
Francis Snare
Eduardo Luis Curia
Don Pendleton
Warren Murphy
Alan Caillou
Claudine Yegh
Jacqueline Bograd Weld
Daniel Cohen
John G. Taylor
Rand McNally
Jane Carruth