GEOLOGY

Detailed explanation-1: -Volcanoes are classified as active, dormant, or extinct. Active volcanoes have a recent history of eruptions; they are likely to erupt again. 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.

Detailed explanation-2: -Dormant Volcano: Volcanoes are often considered to be extinct if there are no written records of its activity.

Detailed explanation-3: -If there is evidence for magma beneath the ground-for example, as indicated by magma-related seismicity and/or ground deformation, or by an active hydrothermal system-then the volcano should be considered “active” but currently “dormant, ” regardless of the time since its last eruption.

Detailed explanation-4: -Abstract. Stratigraphy and radiocarbon dating of pyroclastic deposits at Merapi Volcano, Central Java, reveals  10, 000 years of explosive eruptions.