Volcanic ash.
Spate is a large meaning or amount.
Oskar Spate was born in 1911.
Clive Spate was born in 1952.
Oskar Spate died in 2000.
After several days of heavy rain, the region experienced a spate of flash floods.
The cast of Spate - 2013 includes: Tim Moremen
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in spate http://www.thefreedictionary.com/in+spate
Spate irrigation is mostly done in semi-arid areas. Normal areas have conventional irrigation.
An agreement is a compromise or understanding between two parties concerning a specific set of details. A spate agreement is when the two parties agree exactly with no need for compromise.
Oskar Hermann Khristian Spate has written: 'Australia, New Zealand and the Pacific' 'The compass of geography' -- subject(s): Geography 'India and Pakistan'
spate forceful flowings would be spates