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 ".