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: -Extinct implies that there is no magmatic, seismic or degassing activity going on at the volcano, and that it’s never expected to have any in the future. That’s very difficult to prove, and requires field mapping to determine the volcano’s eruptive history.

Detailed explanation-3: -Extinct → Extinct volcanoes are those which have not erupted in human history.

Detailed explanation-4: -Even dormant and extinct volcanoes are becoming active again. An extinct volcano by definition is a dead volcano, which has not erupted in the last 10 000 years and is not expected to ever erupt again.

Detailed explanation-5: -If a volcano is not presently erupting but might at some future date, it is called dormant. If a volcano has stopped erupting forever, it is called extinct. Generally, volcanoes are labeled extinct when no eruption has been noted in recorded history.