英文關鍵字
beautiful
calcium
carbonate
depositions
deposits
environment
flow
flowing
formation
geological
geology
georgia
geothermal
heat
hot
landmark
limestone
mineral
national
natural
nature
park
place
plateau
rock
salt
scenery
scenic
sedimentary
seep
silica
spa
spring
summer
surface
terrace
thermal
travel
travertine
usa
water
yellow
yellowstone