Active, Dormant & Extinct

Activities to try

1. 1

   Volcano-sorting bench: classify by evidence, with a planted surprise

   Why it works: Volcano status is a judgement from eruption history and monitoring evidence measured against a very long lifespan; a long-quiet volcano may be dormant, not extinct, and dormant is not the same as dead or safe.

   1. Sort a deck of volcano cards into three bins — active, dormant, extinct — using each card's eruption-history timeline and monitoring clues (last eruption date, gas/ground-swelling signs, whether a magma supply is present).
   2. Include one 'trap' card: a volcano silent for 400 years that many learners may file as 'extinct'. Make sure its card evidence points to dormant if read carefully (for example, a history of eruptions separated by long gaps and no evidence that its magma supply has ended), so the reveal is fair. After they commit, reveal that it erupts again — showing it was dormant (capable of erupting) all along and never truly extinct — with the line 'quiet for a long time isn't the same as finished.'
   3. Use a time-scale slider (optional interaction) to compare human lifetimes — 'no eruption in your grandparents' lifetime' — against the volcano's age, showing that 400 years is a blink.
   4. State for each card WHY you chose a bin, pointing to the specific evidence rather than the mountain's shape or greenery.
2. 2

   Consolidation: categorise and judge from evidence blurbs

   Why it works: Learners can apply the three categories to new cases and recognise that long quiet alone does not prove extinction.

   1. Read short evidence blurbs for several volcanoes and sort each into active, dormant, or extinct.
   2. Answer a reasoning question: 'A volcano hasn't erupted in 300 years — is it definitely extinct?' and justify the answer ('no — it could still be dormant').
   3. Explain in your own words the difference between dormant and extinct, and what evidence would help decide if a volcano is truly extinct.
3. 3

   Example trio with 'sleeping vs never-waking' reveal

   Why it works: The categories map onto a memorable metaphor — asleep (dormant, can wake) versus never-waking (extinct) — anchored to concrete examples and judged from evidence rather than looks.

   1. Examine three example volcanoes, one of each status, each with a short eruption-history/monitoring summary, and predict the status of each FROM that evidence — not from the mountain's appearance — before revealing it.
   2. For the dormant example, answer 'Could this sleeping one wake up?' and then reveal: 'Yes — dormant means asleep, not gone.'
   3. Discuss the 'sleeping vs never-waking' metaphor: dormant = asleep and can wake; extinct = not expected to wake because its magma supply seems to be gone.