![Dr Darren Gravley showing pyroclastic deposits to students.](http://static.sciencelearn.org.nz/images/images/000/000/739/full/Dr-Darren-Gravley-and-pyroclastic-deposits20160118-19253-1349bn0.jpg?1674164837)
Dr Darren Gravley points out to students various features of the pyroclastic deposits in the St Kentigern College grounds, Auckland.
Dr Darren Gravley points out to students various features of the pyroclastic deposits in the St Kentigern College grounds, Auckland.