Waimangu guide Alfred Warbrick used sandbags to modify and slow the discharge from a spring close to the edge of Lake Rotomahana. Silica has gradually been deposited over the sandbags, producing the feature known as Warbrick Terrace, which is partly covered by colourful algae.
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GNS Science
Reference:
CT258
Photograph by Lloyd Homer
Permission of GNS Science must be obtained before any use of this image.
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