Complete the sentence about Mount Pinatubo with the correct year: Located on the tripoint of Zambales, Tarlac and Pampanga provinces, most people were unaware of its eruptive history before the pre-eruption volcanic activity in early ______.

Answer and explanation

Correct answer: A. 1991

Mount Pinatubo is an active stratovolcano in the Zambales Mountains on Luzon, at the tripoint of Zambales, Tarlac and Pampanga. Few people knew of its eruptive history until the volcanic activity in early 1991, before the huge VEI-6 eruption on June 15 of that year. As that eruption was in 1991, a pre-eruption date of 2006 cannot be right.

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