Silica In Mars Rocks Intrigue Scientists (270)
KNOXVILLE, Tenn. — Discovery of silica-rich rocks on Mars similar to those on Earth may be the NASA Pathfinder’s most intriguing find, a University of Tennessee geologist said Monday. Dr. Harry McSween said “Barnacle Bill” and other Martian rocks analyzed by Pathfinder’s instruments seem similar to Earth rocks known as andesites, which are formed by