more a volcano looks like a volcano, the smaller it really is"
Lake Taupo has been an active volcano for more than 65,000
years. In that time it has shown a random pattern of exceptionally
large eruptions interspersed with many smaller events.
The area around Taupo is covered in 10m of pumice deposited
from eruptions in the last 22,000 years and a further 5m from
it's largest eruption 26,500 years ago.
is not a large mountain because the eruptions have been so large
and so violent that all material has been deposited far from the
vent and subsequent collapse of the ground has formed a caldera
(a collapsed volcano). Many of the lakes around Rotorua were formed
in the same way.