Phreatic eruptions take place when ________.
A) volatiles effervesce prior to lava flow
B) groundwater interacts with magma
C) basaltic lava clogs the eruptive vent
D) lava or pyroclastic debris erupts by bursting through the sides of the volcano

Question

Quizplus · Accepted Answer

Phreatic eruptions occur when groundwater interacts with magma. Heat from the magma can cause the groundwater to flash into steam, which then causes an explosion. There is no lava involved in phreatic eruptions.

Phreatic Eruptions Take Place When ________