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