Trail well cleared. Area flat or slightly sloped, no fall hazard Trail with continuous line and balanced ascent. Terrain partially steep, fall hazard possible exposed sites may be secured with ropes or chains, possible need to use hands for balance. Partly exposed sites with fall hazard, scree, pathless jagged rocks sometimes need for hand use to get ahead. Terrain quite exposed, precarious grassy acclivities, jagged rocks, facile snow-free glaciers. single plainly climbing up to second grade. Exposed, demanding terrain, jagged rocks, few dangerous glacier and snow climbing up to second grade. Often very exposed, precarious jagged rocks, glacier with danger to slip and fall