英文關鍵字
background
biology
boiling
bubble
conservation
cycle
distance
distant
ecology
feature
formation
fumarole
gamebirds
gathering
geology
geothermal
geyser
grass
grasslands
green
group
hayden
hills
hot
landscape
mist
national
northern
open
park
pattern
peak
pines
pool
rhythm
rolling
section
setting
shape
shine
silhouette
sky
spring
steamy
stream
strength
sun
thermal
valley
vast
volcano
wide
wild
wilderness
wildlife
winged
wings
wonder
wyoming
yellowstone