Alluvial-dam lakes, [423].
Alluvial fan, [213].
Alpine glaciers, [383], [386].
Alterations of minerals, [27].
Altitude, of different parts of lithosphere, [18].
American Falls, future extinction of, [357].
Amphiboles, [459].
Amphitheaters, formed on drift sites, [369].
Amundsen, R., cited, [23].
Analysis, of folds, [54].