Mount Pinatubo
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40 free Mount Pinatubo trivia questions with answers — geography quiz, new questions added Oct 2026.
Mount Pinatubo was an overlooked, jungle-covered peak in the Philippines until 1991, when it produced one of the biggest volcanic eruptions of the twentieth century. Scientists saw it coming, tens of thousands of people got out in time, and the cloud it sent up changed the weather around the world. These questions cover the fun facts people look for about Mt. Pinatubo: how the mountain woke up, what the eruption did to nearby towns and military bases, the mudflows that kept coming for years afterwards, the lake that sits in the crater, and the legends local people tell about the summit. The quiz suits students revising volcanoes, travellers planning the crater trek, and anyone who remembers the news from that June. Every answer comes with a short explanation, so you learn something even when you guess.
30 of 40 questions with answers and explanations. Play the quiz
Q 01What killed most of the people who died in Mount Pinatubo's 1991 eruption, despite mass evacuations?
Collapsing roofs
Collapsing roofs caused most of the deaths, because ash soaked by heavy rain grew far too heavy for buildings to bear. Lava played no part.
Q 02Which natural disaster struck on the same day as Mount Pinatubo's climactic eruption in June 1991?
A typhoon
A typhoon named Yunya struck that same day, turning the falling ash into a heavy rain of mud, while its winds flung ash in every direction.
Q 03What happened to average global temperatures in the two years after Mount Pinatubo's 1991 eruption?
They dropped about 0.5 °C
They dropped about 0.5 °C, because a haze high in the atmosphere bounced sunlight back into space. The chill lasted from 1991 through 1993.
Q 04How long had Mount Pinatubo been dormant before it reawakened with steam blasts in April 1991?
About 500 years
About 500 years of quiet had let lush vegetation hide the volcano so well that most people living nearby knew nothing of its violent past.
Q 05Which US Air Force site, 14 km east of Mount Pinatubo's summit, was abandoned after the eruption?
Clark Air Base
Clark Air Base was handed back to the Philippines in November 1991, after ash wrecked its buildings and mudflows swept across its grounds. It later became an international airport and freeport zone.
Q 06How does the 1991 eruption rank against Mount Pinatubo's earlier eruptions in the geologic record?
Among the smallest
Among the smallest, remarkably: the eruption that gave birth to the modern volcano is estimated to have been five times larger than the one in 1991.
Q 07What nickname was given to the June day when Mount Pinatubo's ash brought 36 hours of darkness?
Black Saturday
Black Saturday saw an ash cloud more than 300 miles across turn day into night, while wet ash settled over the land like heavy grey snow.
Q 08Mount Pinatubo's eruption was about ten times larger than the 1980 blast from which US peak?
St. Helens
St. Helens was dwarfed: the Philippine blast threw out over ten cubic kilometres of ash and rock, ranking second among all eruptions of the 20th century.
Q 09What did friction inside Mount Pinatubo's rising ash column generate in abundance in June 1991?
Lightning
Lightning flashed through the plume as colliding ash particles built up electric charge, even while the column climbed 24 km above the summit.
Q 10Pinatubo sent more particles into the upper atmosphere than any eruption since which 1883 disaster?
Krakatoa
Krakatoa had held that mark for over a century; satellites tracked the 1991 cloud several times around the globe, and its haze lingered for three years.
Q 11On which Philippine island does Mount Pinatubo stand, about 87 km northwest of the capital, Manila?
Luzon
Luzon is also home to Manila, and about six million people live close to the volcano, which rises at the point where three provinces meet.
Q 12Which gas, nearly 20 million tons of it, did Mount Pinatubo blast high into the atmosphere in 1991?
Sulfur dioxide
Sulfur dioxide turned into a haze of tiny acid droplets that circled the Earth in about three weeks and covered the whole globe within a year.
Q 13What name is given to the volcanic mudflows that buried towns around Pinatubo for years after 1991?
Lahars
Lahars form when heavy rain washes loose ash downhill; they can race along at 65 km per hour, and here they did more damage than the eruption itself.
Q 21Which indigenous people, driven from Pinatubo's slopes in 1991, won title to the summit in 2010?
The Aeta
The Aeta numbered about 20,000 on the mountain, and all but about 20 were led to safety before the eruption wiped out their villages.
Q 22Mount Pinatubo rises where Pampanga and Tarlac meet which third province, home to the crater lake?
Zambales
Zambales also lends its name to the mountain range the volcano belongs to, a chain running down the western side of the island.
Q 23Which US naval station south of Mount Pinatubo was blanketed in ash and handed back in 1992?
Subic Bay
Subic Bay became the escape route: warships sailing from the port carried thousands of evacuees to Cebu, the first leg of their journey home.
Q 14What landform, 2.5 km wide, was left when Mount Pinatubo's summit collapsed in the 1991 eruption?
A caldera
A caldera formed because so much magma drained from beneath the peak that it caved in, leaving the mountain about 260 m shorter than before.
Q 15Mount Pinatubo's 1991 ash cloud rose about 35 km, punching into which layer of the atmosphere?
Stratosphere
The stratosphere received the cloud, and the haze that formed there gradually spread around the entire planet over the following year.
Q 16Which US agency helped Filipino scientists forecast Pinatubo's 1991 eruption and save thousands?
US Geological Survey
The US Geological Survey flew in portable instruments, and the joint team's warnings cost under $1.5 million while sparing at least 5,000 lives.
Q 17The lake that filled Mount Pinatubo's new crater after 1991 was at first hot and highly what?
Acidic
Acidic water with a pH as low as 2 and a temperature near 40 °C slowly mellowed as years of monsoon rain diluted and cooled the lake.
Q 18Mount Pinatubo's first big explosive eruption came on June 12, 1991, which Philippine holiday?
Independence Day
Independence Day in 1991 brought an ash column 19 km high, the opening act of a climax that followed three days later.
Q 19What type of volcano is Mount Pinatubo, the same steep, explosive kind as Italy's Mount Etna?
Stratovolcano
Stratovolcano magma is thick and sticky, so gas cannot escape easily and pressure builds until the mountain blows apart instead of oozing lava.
Q 20Mid-latitude levels of which atmospheric gas fell to record lows after Pinatubo's 1991 eruption?
Ozone
Ozone was destroyed at a much faster rate after the eruption, and in 1992 the hole over Antarctica grew to the largest size recorded up to then.
Q 24Who was president of the Philippines when Mount Pinatubo erupted, a year before leaving office?
Corazon Aquino
Corazon Aquino faced the eruption eleven months after a magnitude 7.8 earthquake, in the middle of a national debate over keeping US military bases.
Q 25Which sky events looked far darker than usual in the year after Mount Pinatubo's 1991 eruption?
Lunar eclipses
Lunar eclipses normally leave a dimmed Moon in view, but dust in the atmosphere absorbed so much sunlight that the eclipsed Moon was hardly visible at all.
Q 26Which US island territory received most of the American evacuees fleeing Mount Pinatubo in 1991?
Guam
Guam's Andersen Air Force Base processed the vast majority of the roughly 20,000 evacuees before they flew on to the continental United States.
Q 27The name Pinatubo may carry which meaning in Tagalog, perhaps a folk memory of an old eruption?
Made to grow
Made to grow, or a fertile place where one can raise crops, is how the word can be read, which may hint at knowledge of an eruption around 1500.
Q 28Why did farmers near Mount Pinatubo switch to peanuts, cassava and sweet potatoes after 1991?
They ripen quickly
They ripen quickly, so the harvest could be brought in before late-summer rains sent fresh mudflows across the fields.
Q 29In a Pinatubo legend, the fire-breathing sea spirit Bacobaco could change into which animal?
A huge turtle
A huge turtle was his other form; chased by spirit hunters, he dug a great hole in the summit and showered the land with rock, mud and fire for three days.
Q 30Which Philippine president died in 1957 when his plane, named Mt. Pinatubo, crashed in Cebu?
Ramon Magsaysay
Ramon Magsaysay named his presidential C-47 after the then-quiet volcano; the plane struck Mount Manunggal, killing him and 24 others on board.