Radioactive decay
Crust
vent a+
vent a+
Yes!
Some examples of volcanic activity leading up to an eruption include increased seismic activity, such as small earthquakes or tremors, ground deformation or bulging caused by magma movement, increased gas emissions, such as sulfur dioxide, and the appearance of new fissures or vents on the volcano's surface through which magma can escape. These signs can help scientists monitor and predict volcanic eruptions.
Crust
Mostly Volcanic activity and Earthquakes
vent a+
vent a+
vent a+
Yes!
Idk
During a volcanic eruption or on a constructive boundary
a volcanic erruption
weather ,seismic ,volcanic
Its Tectonic Activity
Pressure from the earths core