It is a sort of acidic hot spring, or fumarole, with limited water. It usually takes the form of a pool of bubbling mud.
Yes.
Lahar
Volcanic eruptions are common in some of the Earth's volcanic hot-spots.
Hot springs and Geysers. A geyser is a foundation of water and steam that erupts from the ground. A hot spring forms when groundwater heated by a nearby body of magma rises to the surface and collects in a natural pool.
pyroclastic flow
lava flows clouds of ash hot volcanic gases landslides avalanches of mud snow and rock
because of pyroclastic flow (mixture of hot gas and rock), molten rocks(volcanic bombs) or lahars (volcanic mud flow)
Archaebacteria
Volcanic rocks are hot if they are freshly erupted. Otherwise, no.
Lahar
Yes.
Yellowstone is a volcanic caldera and everything that you see from mud pots, geysers, and steaming hot pools are from the volcanic activity. It is just one huge volcano and if it ever erupts several states will be in trouble.
Mud Slides, tsunami, volcanic erruptions
Volcanic eruptions are common in some of the Earth's volcanic hot-spots.
Hot springs and Geysers. A geyser is a foundation of water and steam that erupts from the ground. A hot spring forms when groundwater heated by a nearby body of magma rises to the surface and collects in a natural pool.
What about "pool chemicals in a hot tub"?
pyroclastic flow