Cirques, reversed grades, lakes, and stri are on every hand.
In the majority of cases the cirques have lakes on their floors.
The cirques now partly filled with damp snow must then have been overflowing with dry snow above and ice below.
Imagine ranges glacier-bitten alternately on either side with cirques of three or four thousand feet of precipitous depth.
It is these cirques and valleys which constitute Glacier's unique feature, which make it incomparable of its kind.
A series of cirques means a succession of glacial and interglacial periods.
The cirques described by M. Desnoyers belong to the same class as the swallow-holes.
These cirques frequently lie close together, separated by a thin precipitous wall, or ridge.
It is now known that cirques are produced primarily by the eroding action of the ice masses embedded in them.
Every canyon leads up to one or more amphitheaters, or cirques, with sheer bare walls hundreds of feet high.