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earth, in geology and astronomy

(Encyclopedia)CE5 A. Cross section of the earth, showing its shells B. Detailed cross section of the crust and upper mantle: The lithosphere consists of the hard rock in the crust and upper mantle, lying above t...

Alfonso VI, Spanish king of León and Castile

(Encyclopedia)Alfonso VI, 1030–1109, Spanish king of León (1065–1109) and Castile (1072–1109). He inherited León from his father, Ferdinand I. Defeated by his brother Sancho II of Castile, he fled to the Mo...

Monroe, Paul

(Encyclopedia)Monroe, Paul, 1869–1947, American educator, b. North Madison, Ind., grad. Franklin College, 1890, Ph.D. Univ. of Chicago, 1897. At Teachers College, Columbia, he was professor of education from 1902...

Nicholson, Francis

(Encyclopedia)Nicholson, Francis, 1655–1728, British colonial administrator in North America. Lieutenant governor under Sir Edmund Andros, he fled (1689) to England during the revolt in New York led by Jacob Leis...

Bagley, William Chandler

(Encyclopedia)Bagley, William Chandler, 1874–1946, American educator and editor, b. Detroit, grad. Michigan State College (now Michigan State Univ.), 1895, M.S. Univ. of Wisconsin, 1898, Ph.D. Cornell, 1900. He t...

Cambridge, University of

(Encyclopedia)Cambridge, University of, at Cambridge, England, one of the oldest English-language universities in the world. Originating in the early 12th cent. (legend places its origin even earlier than that of t...

Malan, Daniel François

(Encyclopedia)Malan, Daniel François dänyĕlˈ fräNswäˈ məlänˈ [key], 1874–1959, South African political leader. A minister of the Dutch Reformed Church, he left the pulpit after the outbreak of World War...

de Klerk, F. W.

(Encyclopedia)de Klerk, F. W. (Frederik Willem de Klerk) frĕdˈərĭk vĭlˈəm də klûrkˈ ...

rock carvings and paintings

(Encyclopedia)rock carvings and paintings, designs inscribed on rock surfaces and huge stone monuments in many parts of the world by prehistoric or preindustrial peoples. They have been found on every continent and...

perfluoroalkyl and polyfluoroalkyl substances

(Encyclopedia)perfluoroalkyl and polyfluoroalkyl substances (PFAS), a group of several thousand synthetic organic chemical compounds made up of a chain of carbon atoms bonded to fluorine atoms. PFAS, which resist w...