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What would happen if all volcanoes on Earth erupted at once?

There are about 1,500 25.____________(POTENTIAL) active volcanoes around the world. A volcano counts as active if it has erupted in the last 10,000 years and only around 550 have erupted in recorded history. But the exact number of eruptions is much less 26.____________(IMPORTANCE) than their size. Eruptions are classified using the Volcanic Explosivity Index (VEI). The largest eruption ever recorded was Mount Tambora in 1815, with a VEI of 7. The 27.____________(EXPLODE) could be heard 2,600km away and more than 160km³ of material was thrown into the atmosphere. This single volcano caused temperatures in the northern hemisphere to drop by 0.5°C for six months, as dust blocked out the Sun.

That was one volcano. There are 32 known VEI 7 or VEI 8 volcanoes and if they all erupted at once, it would easily be an extinction-level event for the 28.____________(MAJOR) of living things, including humanity. The initial eruptions would cause most aeroplanes in the air to crash, destroy buildings in the western USA, South America, southern Europe and the Far East, and cause power grids to fail across most of the developed world. Drinking water supplies would become toxic by ash, global temperatures could fall by 15°C for six months, and acid rain would make agriculture 29.____________(POSSIBLE) to grow for the next decade. Luckily, this is almost guaranteed never to happen.

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