What happens to the form of hillslopes as they steepen and the relationship between sediment flux and slope steepness becomes more nonlinear? Choose just one These hillslopes tend to develop some concavity along some portions of their profile, in addition to convexity. These hillslopes tend to become less convex and more planar, especially towards the upper ends (closer to the topographic divide). These hillslopes tend to become less convex and more planar, especially towards their lower ends (closer to the base of the slope). These hillslopes get steeper on average but do not change their form in any other way relative to less steep hillslopes in which sediment flux and slope steepness are proportional