This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
The Quarterly journal of the Geological Society of London . PEOCEEDINGS OF THE GEOLOGICAL SOCIETY Feb and of bulk and dimensions determined by the comparative fluidity of the expelled lavas and the comparative abundance and character of the fragmentary ejections When as often is the case owing to the obstruction of the central