The 1883 eruption that was heard across the world — and changed the sky itself.
Each new word is hidden in a sentence. Read it aloud and say what you think the bold word means from the rest of the sentence — then reveal it and see how close you were.
Read each part. After it, there's a quick comprehension check (try the questions from memory first), then one thing to discuss.
Krakatoa was a small, uninhabited island in the Sunda Strait, the narrow stretch of water between Java and Sumatra, in what was then the Dutch East Indies and is now Indonesia. It sat directly over one of the most restless boundaries on Earth, where two great sections of the planet's crust grind against each other. For two centuries it had been quiet, its slopes green with forest, and few people gave the mountain a second thought.
Then, in May 1883, the ground began to stir. Columns of steam and ash rose from the peak, and the sea around the island trembled. For weeks the eruptions came and went — impressive, even beautiful, and treated by many as a spectacle. Pleasure boats were chartered so that sightseers could sail out and watch the fireworks. Nobody understood that this was only the mountain clearing its throat.
Beneath the surface, immense pressure was building. Seawater was leaking into the volcano's chambers and being flashed instantly into steam, and the whole system was being loaded like a gun. Through the summer the tremors grew stronger and the ash clouds thicker, until, on the morning of 26 August, the eruptions became continuous and the sky turned black.
1. Where exactly was Krakatoa, and what kind of place had it been before 1883?
2. How did people react to the early eruptions in May?
1. An uninhabited island in the Sunda Strait between Java and Sumatra (the Dutch East Indies, now Indonesia), over an active boundary in the Earth's crust; it had been quiet and forested for about two centuries.
2. Many treated them as a spectacle — boats were chartered so sightseers could sail out and watch, and few sensed the danger.
The climax came on the morning of 27 August 1883. In a series of colossal explosions, the volcano tore itself apart. The largest blast, at around ten o'clock, is often called the loudest sound in recorded history. It was heard nearly 3,000 miles away on the island of Rodrigues, near Mauritius, where a coastguard reported what he thought was distant gunfire. The pressure wave from the explosion circled the entire planet several times and was registered by barometers around the world.
But it was not the sound that killed. As the emptied mountain collapsed into the sea, enormous volumes of water were displaced, and a series of towering tsunamis were sent racing outward. Waves more than thirty metres high struck the low-lying coasts of Java and Sumatra, sweeping away entire towns and villages in minutes. The great majority of the roughly 36,000 people who died were drowned by these waves, not burned by the eruption itself. Ships were carried far inland; one gunboat was left stranded well above the shoreline.
By the time the sea grew still, the island of Krakatoa had almost ceased to exist. Two-thirds of it had been blown away or had sunk beneath the water, leaving only fragments and a vast submerged crater where a mountain had stood. Darkness covered the region for days as ash fell like grey snow, and the survivors were left to count an almost unimaginable loss.
1. Why is the eruption of 27 August famous in terms of sound?
2. What actually caused most of the deaths, and roughly how many people died?
1. The largest blast is often called the loudest sound in recorded history — heard nearly 3,000 miles away, and its pressure wave circled the Earth several times.
2. Most deaths were caused by the tsunamis (waves over 30 metres high) that struck Java and Sumatra; roughly 36,000 people died, most of them drowned.
The eruption did not end when the sea grew calm; in a sense it was only beginning. Millions of tonnes of ash and gas had been thrown high into the atmosphere, and this fine veil of dust was carried by high-altitude winds right around the globe. For months, sunlight was scattered in strange ways: people from London to New York saw the sky glow blood-red at dusk, and vivid sunsets were reported across the world. Some historians believe the eerie red sky in Edvard Munch's painting The Scream was inspired by these very evenings.
The dust also cooled the planet. Global temperatures were lowered by more than a degree in the year that followed, and weather patterns were disturbed for years — one of the clearest early demonstrations that a single event in one place could change the climate of the whole Earth. Because the telegraph now linked the world, news of the disaster travelled almost instantly, and Krakatoa became arguably the first truly global news event.
Scientifically, the eruption became a landmark. It was studied in extraordinary detail by an official commission, whose reports helped found the modern understanding of how great eruptions behave. And the volcano itself was not finished: decades later, a new cone rose from the sea in the same spot, and it was named Anak Krakatau — "Child of Krakatoa." It is still active today. The mountain that was heard around the world in 1883 had, in the end, only gone to sleep again.
1. What effects did the ash and dust have on skies and on the climate?
2. What is Anak Krakatau, and why does the eruption matter to science and to news history?
1. The dust scattered sunlight, producing vivid red sunsets worldwide, and cooled the planet by more than a degree, disturbing weather for years — early proof that one event could affect global climate.
2. Anak Krakatau ("Child of Krakatoa") is the new, still-active volcano that later rose on the same spot. The eruption was studied in detail and helped found modern volcanology, and — carried by the telegraph — it became arguably the first global news event.
The Krakatoa story is full of enormous events whose "doer" is either the volcano, the sea, or simply nobody at all — the island was destroyed, the sound was heard, the towns were swept away. That is exactly what the passive voice is for: it lets you put the event, not the actor, at the front of the sentence.
Rewrite the underlined active verb as a passive. Keep the same tense.
1. The blast shattered windows a hundred miles away. → Windows a hundred miles away by the blast.
2. The tsunamis destroyed the coastal towns. → The coastal towns by the tsunamis.
3. Scientists study the eruption to this day. → The eruption to this day.
1. were shattered (past passive: were + past participle)
2. were destroyed (past passive)
3. is studied (present passive: is + past participle)
Put the verb in brackets into the correct passive form (mind the tense and the participle).
1. Most of the island (blow) apart in a single morning.
2. The pressure wave (register) by barometers around the world.
3. Today, the region (monitor) constantly for new activity.
1. was blown (irregular participle: blow → blown)
2. was registered (past passive)
3. is monitored (present passive)
Fill each gap with a passive verb (correct tense and participle). Read it aloud once you're done.
On 27 August 1883, most of Krakatoa (destroy) in a series of explosions. The largest sound (hear) nearly 3,000 miles away. Along the coast, whole towns (sweep) away by the waves, and around the world the sky (colour) red for months.
was destroyed · was heard · were swept · was coloured
Notice how the passive keeps the focus on the events, not on any single "doer" — exactly the tone of a history or news report.
Hold on to this — you'll need it in the Speak tab, where retelling a disaster as a clear, objective report is exactly what the passive is built for.
You've read the story and you have the words — so now the real thing is within reach. There's a full podcast episode that tells this story in much greater depth, in natural, real-speed English. It's optional: the lesson stands on its own without it.
From the Noiser podcast network. Hosted by historians, roughly 50 minutes. Open the show on Spotify and search "Short History Of Krakatoa" to find the episode.
Open the show on Spotify →This is the heart of the lesson — do all of it out loud. The timer is there to keep you going: fill the time with detail rather than escaping it.
Tell the story of Krakatoa in your own words, as if to someone who has never heard of it. Move through the arc: the quiet island in the Sunda Strait → the first eruptions in May, watched as a spectacle → the colossal blast of 27 August, the loudest sound ever recorded → the tsunamis that killed tens of thousands → the red skies, the global cooling, and Anak Krakatau rising in its place.
Tell it like a report: use the passive voice at the big moments ("the island was destroyed", "the sound was heard", "the towns were swept away"), and work in at least five key words (magma, plume, eruption, tsunami, shock wave, report, caldera, atmosphere, afterglow, telegraph).
Before Krakatoa, people sailed out to watch the eruptions for fun. Today we have monitoring, warnings and evacuation plans. How much can science really protect us from an event on this scale? Build an argument, using other examples you know — earthquakes, floods, other volcanoes — and decide where the limits of prediction lie.
Krakatoa's effects reached right around the world. Describe another event — natural or human — whose consequences spread far beyond where it began. Report it in the passive: what was destroyed, what was changed, what was felt far away.
Stuck for an idea? Pick one of these and run with it: