What is a mountain?
vCommon
usage:
v600 m or more
of local relief defines a mountain
vLess than
600m is a hill
vHigh
mountain/alpine areas (Troll 1973; Arct. Alp. Res., 5, 19-27):
vRelative to
terrain features
vUpper
timberline
vSnow line
Himalayas:
Photo credit: NASA/Science Photo Library