The sidewalls vary from very steep to precipitous. It has some of the deepest precipitous cliffs of any canyon on the planet. A precipitous escarpment facing the Cumbum Valley is on the south. Overfishing continues despite repeated warnings of the current precipitous decline. Mass extinction events occur when life undergoes precipitous global declines. The Hellenised city thus fell into a precipitous decline. His death marked the beginning of the increasingly precipitous decline of the once-powerful Powhatan. These conditions forced both wheat agriculture and the lumber industry into a precipitous decline. Such extrapolating ended with the Giuliani campaign's precipitous decline and January 2008 withdrawal. This deterioration is gradual for some and precipitous for others. However, they soon ran into two precipitous rock faces along the ridge. There was also a precipitous decline in the boss himself. At that time, the "National Lampoon" magazine entered a period of precipitous decline. Enduring such upheavals caused psychic harm in addition to the precipitous drop in living standards. Crash barriers are installed along the sides of dangerous bends and precipitous verges.