Earthquakes are generally associated with plate tectonic activity, but some earthquakes are generated as a result of volcanic activity (though that itself is ultimately driven by the same forces).
These are formed where water interacts with volcanism. These include geysers ,
fumaroles, hotsprings and mudpots, they are often used as a source of
: Volcanic winter
The amount of gas and ash emitted by volcanic eruptions has a significant effect on the Earth's climate . Large eruptions correlate well with some significant climate change events.