Flexi Says: Mafic magma creates effusive eruptions. The pressure builds but the lava flows fairly quietly. Effusive eruptions are common at Kilauea volcano in Hawaii, where lavas are mafic. Effusive eruptions rarely kill anyone because they move slowly. People can usually be evacuated before an effusive eruption. Still, effusive eruptions can be destructive. There is not much anyone can do to stop a lava flow from destroying a building or road
