Lava that flows in "streams" down the gentle slopes of a volcano rapidly cools on the outside to form a solid crust. The hot liquid lava inside may continue to flow out to leave a hollow lava tube or cave, such as this one at Wiri, Auckland. Negotiations are presently proceeding to secure this important landform from destruction by quarrying — the culmination of a 15-year campaign to persuade the owners, Railcorp to do So. Photo: Lloyd Homer
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https://paperspast.natlib.govt.nz/periodicals/FORBI19890801.2.28.1
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Forest and Bird, Volume 20, Issue 3, 1 August 1989, Page 29
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77Lava that flows in "streams" down the gentle slopes of a volcano rapidly cools on the outside to form a solid crust. The hot liquid lava inside may continue to flow out to leave a hollow lava tube or cave, such as this one at Wiri, Auckland. Negotiations are presently proceeding to secure this important landform from destruction by quarrying — the culmination of a 15-year campaign to persuade the owners, Railcorp to do So. Photo: Lloyd Homer Forest and Bird, Volume 20, Issue 3, 1 August 1989, Page 29
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