Phrase ash formation
- This includes channel development in Hawaiian lava flows and volcanic ash formation in eruptions.
- Fragmentation is a very efficient process of ash formation and is capable of generating very fine ash even without the addition of water.
- Visible on a far hillside is the volcanic-ash formation O'Keeffe called the " white place, " the subject of a series of paintings.
- Following he served as head of the Operations Directorate and between October 2007 and June 2009 he served as commander of the " Ga'ash formation ".