Atmosphere, compressibility of, [8].
Attack, of the weather, [149].
Atwood, W. W., cited, [7], [160], [298], [300], [313], [372].
Axial plane, of folds, [42].
Axis, of folds, [42].
Azurite, [453].
Bacteria, part taken in weathering, [156].
“Bad Lands”, control of relief in, [223], [224].
“Bad Land” topography, [214].
Bajir, [216].