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📘 Look into a mountain's missing top

Stand on Sumbawa and look across Tambora's missing summit. The 1815 collapse left a six-kilometre-wide caldera.

4
lessons
~20 min
to learn
Adults
level
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What you’ll learn

  1. Tambora loses its summitExplain how the 1815 Tambora eruption formed a caldera and produced immediate local hazards.Tambora's missing summit records an eruption that destroyed landscapes and communities on Sumbawa.
  2. The sky changes the clockDistinguish fast-falling ash from stratospheric sulfate aerosols and delayed cooling.Atmospheric chemistry explains why a local eruption can alter sunlight and weather beyond Indonesia.
  3. 1816 turns weather into historyConnect the 1816 seasonal anomaly to agriculture, scarcity, and regional evidence.A planetary signal became human history through local weather and unequal vulnerability.
  4. Krakatoa puts the sea in the storyCompare Krakatau's 1883 tsunami pathway with Tambora's climate pathway.Krakatau shows how island setting, seawater, coastlines, and warning time shape volcanic harm.

Questions this course answers

What physical feature formed when Tambora's summit collapsed in 1815?

The eruption formed a caldera about six kilometres wide and 1,250 metres deep.

Why can sulfur dioxide affect climate longer than coarse ash?

Sulfur dioxide can react in the stratosphere to form sunlight-scattering sulfate aerosols.

What does Year Without a Summer describe most accurately?

The phrase refers to widespread but regionally uneven seasonal anomalies after Tambora.

Why was Krakatau's location especially important in 1883?

Collapse and eruptive processes disturbed seawater near settlements and shipping routes.

Which comparison is strongest?

The eruptions shared volcanic violence but differed in dominant material, setting, timing, and human pathway.

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