• Effusive eruptions are common in Hawaii, where lavas are mafic.
  • Mafic magma pushes toward the surface through fissures.
  • Eventually, the magma reaches the surface and erupts through a vent.
  • The pressure builds but the lava flows fairly quietly.
  • The lava is thin and fluid so that it flows over the ground like a river.
  • It is not much anyone can do to stop a lava flow from destroying a building or road (Figure below) It is difficult to predict a volcanic eruption from a volcano like Kilauea.
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