The huge volume of mafic magma that erupted to form the Columbia plateau basalts of Washington and Oregon are attributed to ___.
A) sea floor spreading
B) a hot mantle plume
C) subduction
D) magma mixing
E) meteorite impact

Question

Quizplus · Accepted Answer

The eruption of the Columbia plateau basalts is attributed to a hot mantle plume, which is a thermal anomaly in the Earth's mantle that can melt and produce large volumes of magma.

The Huge Volume of Mafic Magma That Erupted to Form