Although this is a small sample, it suggests that man-made dust particles predominate over naturally occurring ones.
He said the ash was mostly made up of dust which causes the irritating effect but it also contains 4% silica.
BBC: Mount St Helens spews out steam and ash on 5 October 2004
The dust is made of a honeycomb structure of cells like microscopic golf balls.
At the same time, the experiment's clever design makes it possible to distinguish between man-made and naturally occurring dust particles, and so determine their relative proportions.
Whether a speck of dust is man-made or natural can be worked out from its trajectory.
Comets are made up of water, ice, dust and other elements and minerals, all loosely packed together, Battams said.
Having grown up in a house made of prairie mud bricks, unprotected from dust and grasshopper invasions, the inventor dies a millionaire.
In all, it recorded 159 impacts, which is broadly in line with the predictions made by the models for the number of dust particles that are 850km up.
It consists of five eco-friendly products made from plant oils: organic glass cleaner, brake dust shield, hydrophobic car wash, tire shine and wheel cleaner.
Democrats would dust off all of the hysterical statements that they made about the 1996 welfare reform law and turn up the volume.
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But while the bank accounts might be full, the trophy cabinet continues to gather dust as frustration grows over the lack of progress made on the pitch.
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Which without me, what's his name, who hits so good, is certainly a man who's sure his bats are made of wood could be when summer beats a team to dust.
When the dust settles, it will be South Africa, who were made to follow on 346 behind in the closing stages of day three, who will take any psychological advantages into the second Test, starting at Headingley on Friday.
So most dust now in orbit around earth can be assumed to be man-made.
Each layer consists of an array of elements made of foil, which produce tiny electrical pulses whenever they are penetrated by specks of dust.
When the dust settled, Indiana was 53.2% from the floor, while the Knicks made just 33.7% of their shots.
The way he handled it made her think he was scornful of its binding or paper stock, but then he read the dust flap, shuddered.
Simply stated, I think when the dust settles on this dispute, the gurus of international investment banking will find that their jobs have been made permanently more difficult by the appearance of a new social investment category that has been declared taboo by some of their largest customers, and by the addition of a new and highly complicated variable to their already crowded due-diligence agendas.
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