* Erosion: Over time, the base of the mesa is exposed to more erosion from wind, rain, and other weathering agents. This erosion gradually wears down the steep cliffs, creating a gentler slope at the base.
* Talus Slopes: The erosion of the mesa's cliffs creates a pile of rock fragments at the base called talus. This talus slope forms a natural, gentler angle, further smoothing out the base.
* Sedimentation: As the mesa erodes, sediment from the cliffs can accumulate at the base, contributing to the formation of a gentler slope.
* Differential Erosion: Different rock types erode at different rates. The base of a mesa might be composed of softer rock, which erodes more easily than the harder rock that forms the cliffs, leading to a gradual slope.
In summary: The gentle slope at the base of a mesa is a result of a combination of erosion, talus formation, sedimentation, and differential erosion.
