What is a mountain?
vSubjective
vRoderick Peattie  Mountain Geography (1936)-
Mountains are 1) impressive, 2) enter into the imagination of people living in their shadow, and 3) have individuality.
vObjective definition should include:
vElevation (insufficient criterion, e.g., Great Plains)
vLocal relief (Grand Canyon?, incised into plateau)
vSteepness of slope
vThe amount of land in slopes
Whiteman