英文關鍵字
abstract
aggressive
background
boiling
bubbling
caldera
colorful
crater
ecology
ecosystem
emission
environment
erupting
eruption
fumarole
fumes
geology
geyser
heat
landscape
mineral
mountain
natural
nature
nobody
river
russia
scenery
sky
smoke
splashing
spray
spring
steam
steaming
stinking
sulfur
texture
tourism
vapor
volcano
water