Kōrero: Rock, limestone and clay

Downtown Auckland

Downtown Auckland

The roads and buildings of New Zealand’s cities are all constructed from quarried materials. Crushed rock, sand and cement are mixed together to form concrete – the main material in most buildings. Roads too are mainly constructed out of crushed rock, the base on which asphalt is poured. Auckland’s rapid growth has placed pressure on rock supplies, and by the early 2000s many of the old quarries which excavate the lava flows of volcanic cones such as Mt Wellington and Three Kings were being exhausted.

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GNS Science
Reference: CN18976/20
Photograph by Lloyd Homer

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Me pēnei te tohu i te whārangi:

Carl Walrond, 'Rock, limestone and clay - Raw materials', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/mi/photograph/5198/downtown-auckland (accessed 24 September 2019)

Story by Carl Walrond, published 12 Jun 2006