GEOLOGY

Detailed explanation-1: -A moderately violent phreatomagmatic explosive eruption of Taal Volcano, Philippines, occurred from 28 to 30 September, 1965. The main phreatic explosions, which were preceded by ejection of basaltic spatter, opened a new crater 1.5 km long and 0.3 km wide on the southwest side of Volcano Island in Lake Taal.

Detailed explanation-2: -The 1965 eruption was classified as phreatomagmatic, generated by the interaction of magma with the lake water to produce the violent explosion that cut an embayment on Volcano Island.

Detailed explanation-3: -Volcanoes are often considered to be extinct if there are no written records of its activity. Nevertheless, volcanoes may remain dormant for a long period of time. For instance, the volcanoes of Yellowstone, Toba, and Vesuvius were all thought to be extinct before their historic and devastating eruptions.

Detailed explanation-4: -The Philippine Institute of Volcanology and Seismology (Phivolcs) classifies Taal Volcano as a complex volcano system. It has 47 craters and 4 maars (volcanic craters caused by an eruption occurring when old groundwater is in contact with hot rock or magma).

Detailed explanation-5: -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.