A sill is a formation of igneous rock found in features such as mesas, hogbacks, and cuestas. Although sills can become exposed, sills are formed underground and are thus composed of plutonic igneous rocks. Sills are an intrusive rock formation....

In geology, a sill is a tabular pluton that has intruded between older layers of sedimentary rock, beds of volcanic lava or tuff, or even along the direction of foliation in metamorphic rock. The term sill is synonymous with concordant intrusive sheet....

Beverly Sills, the opera diva who won over fans worldwide with her sparkling voice and charming personality and became a powerhouse in the New York arts world, is gravely ill with cancer, The Associated Press has learned.Sills, 78, was chairwoman of the Metropolitan Opera until...

Beverly Sills, the opera diva who won over fans worldwide with her sparkling voice and charming personality and later became a powerhouse in the New York arts world, is gravely ill with cancer, The Associated Press has learned.Sills, 78, was chairwoman of the Metropolitan Opera...

Beverly Sills, the opera diva who won over fans worldwide with her sparkling voice and charming personality and later became a powerhouse in the New York arts world, is gravely ill with cancer, The Associated Press has learned.Sills, 78, was chairwoman of the Metropolitan Opera...

Beverly Sills was remembered Sunday at Lincoln Center as a larger-than-life personality whose success on the opera stage was matched by her skills as an administrator and a fundraiser for causes including the arts and multiple sclerosis research.The event, "A Tribute to Beverly Sills," was...