fallen rock
a landslide
Convection
Convection
Erosion
leaching
fallen rock
a landslide
Percolation.
Convection
Convection
the downward movement of water through spaces in soil due to gravity
Erosion
Percolation
The downward movement of water through pores and other spaces in soil due to gravity.
If you're referring to water in the soil, yes, gravity is the active downward force, but it can also be influenced by atmospheric pressure. water normally rises in the soil (or a plant) via the forces of cohesion and capillary action.
Turning the palm backward or downward is called pronation. This movement involves rotation of the forearm so that the palm faces downward or backward.