Near the base of ice-sheets, stress is proportional to the surface slope, at least when averaged over a suitable horizontal distance.

At the flow divide, the surface slope is zero, implying that near the base of the ice-sheet, the viscosity increases.

And participating in glider races down the surface slopes.

The surface slopes from 3,000 feet (900 m) in the west to 1,500 feet (450 m) in the east.

Overall, there is a surface slope from the northern east to south-west towards the river.

On the south the surface slopes rapidly into a deep ravine, dry, except in early spring.

In a zero-depth entry pool, the bottom surface slopes gradually from above water down to depth.

Due to the lake's origin, its underwater slopes are steep, following the surface slopes.

When a mass of snow and ice is sufficiently thick, it begins to move due to a combination of surface slope and pressure.

Make sure that when you are finished, the soil at the surface slopes away from the house, as indicated in the drawing.