GEOLOGY

Detailed explanation-1: -Dormant volcanoes have not erupted for a very long time but may erupt at a future time. Extinct volcanoes are not expected to erupt in the future. Inside an active volcano is a chamber in which molten rock, called magma, collects.

Detailed explanation-2: -Volcanologists use that term as shorthand for “potentially active, ” so a “dormant” volcano is one that is not erupting now, but that is considered “active” because it could erupt in the future. Mount Hood is an active volcano that is currently dormant.

Detailed explanation-3: -“Data gathered from ice cores on the frequency of eruptions over deep time suggests there is a one-in-six chance of a magnitude seven explosion in the next one hundred years. That’s a roll of the dice, ” said article co-author and CSER researcher Dr.

Detailed explanation-4: -The tectonic plate continues to shift above the hotspot, and eventually the volcano is shut off from the magma chamber beneath. And so the magma finds a new source to the surface, creating a new active volcano.

Detailed explanation-5: -Scientists believe the magma chambers-or reservoirs of molten rock-under dormant volcanoes are filled with sticky, viscous mush. For a volcano to “wake up, ” this mush needs to be thoroughly heated by fresh, hot magma rising up from the deep Earth.