Numerous ancillary factors include bedrock-loess interface, slope steepness, vegetation cover, and land utilization.
Despite the weak relationship between slope steepness and tephra thickness, variability in thickness is quite high.
This is reflected in a decline in adverse slope steepness with increasing overdeepening planform size.
Physiographic predictors were latitude, elevation, distance from salt lakes, slope steepness, potential insolation, and topographic convergence.
Rainfall, elevation and slope steepness are the major variables explaining the species distribution.
This means that stronger tectonic activities increase slope steepness and thus increase slope instability and erosion rates.
Smith and Whitt (1948) developed an equation as product of average annual soil loss for claypan soils for a specific rotation, slope length, slope steepness, and row direction; slope steepness; slope length; soil erodibility; and support practice.
Soils are highly variable, with soil types being strongly related to parent materials, elevation and slope steepness.
Considering the effect of slope steepness and slope length, Zingg (1940) developed an empirical equation for calculating field soil loss.
The least sensitive parameters observed were average slope length (SLSUBBSN), average slope steepness (SLOPE) and biological mixing efficiency (BIOMIX), respectively.
Despite the poor relationship between tephra thickness and slope steepness the thickness of thin tephras is highly variable.
