Name the term for the sequence of distinct soil profiles that develops down a single hillslope on one parent material under one climate, the differences arising from slope position alone.

A soil catena is that downslope sequence. Because parent material and climate are constant, the profile differences come from drainage, erosion and deposition changing with slope position: thin coarse soils on the crest, deeper accumulation on the footslope, deep waterlogged soils in the valley bottom.