![Little Barrier Island, an extinct andesite cone.](http://static.sciencelearn.org.nz/images/images/000/003/059/full/LittleBarrierIsland_HauturufromAbove.jpg?1674169740)
An extinct andesite cone. The lava was thick so it formed a steep-sided cone, which has been weathered over time to form the present shape of the island. Last erupted between 1 and 3 million years ago.
Acknowledgement: Dick Veitch
An extinct andesite cone. The lava was thick so it formed a steep-sided cone, which has been weathered over time to form the present shape of the island. Last erupted between 1 and 3 million years ago.
Acknowledgement: Dick Veitch