Inbreak, of lava surface, [107].

Incised topography, [301].

Inherited basin glacier, [387-389].

Interlobate moraines, [314].

Inter-pluvial periods, [198].

Intricate pattern of river etchings, [158].

Intrusive rocks, [32], [462].

Islands, land-tied, [241];

steep rocky, due to submergence, [252].

Isobases, [347].