1st day off - visit to good Old Faithful.

Old Faithful erupting. Old Faithful is the most famous geyser not because its the highest. Its famous because its the most predictable, highest of the predictables, and with the short waiting time and error of waiting time (like maybe plus minus 10 min). Some geyser only erupt a gew times in 10s of years, or some waiting time error can be like plus minus 2 hours or 6 hours. Its a big range of everything. The biggest geyser is Steamboat Geyser. Made me think of steamboat buffet when i pass there. Then we started hallucinating of eating steamboat..

Just a little education corner here. A guide told us that thermal features is divided into 4 types. Geyser - that is the one you see erupting. Hot Spring- you can see hot water on the surface, When there's bubbles, it may not mean that its boiling. it might be just air coming from the bottom of the vent. Mud Pot - these are very thick solution you see it bubbling. The hot water from the broung dissolves away the surrounding acidic rock, mixing it together and you got thic thick soup thing. Fumaroles - also known as steam vents, the water level is below the ground, hence what you see is only steam coming out from the ground. This is the hottest thermal feature that can exist. if i;m not wrong, can go up to 200 degree C.