altitude
branches
cold
color
commitment
cortex
drop
ecological
ecology
green
high mountain
holiday
indication
land
leaves
life
mountain
mountain range
mushrooms
number
plant
precipitation
relaxation
resistant
robust
rock
roots
season
seasons
signal
signposting
silence
slope
snow
soil
spring
summer
tiresome
top
track
training
travel
tree
trip
vegetation
walk
walkway
water
winter
wood
woodman
woods