(3) - Drag the magnet over the ground that is exposed to the open sky. Natural drain points, such as the debris from drain spouts works quite well. In a few minutes' time you will get lots of debris, iron-containing rocks and rusty metal bits from time past, as well as hopefully a micrometeorite, but highly probable, some of these spheres.
(4) - Clean the gathered material with gently flowing water and dry.
(5) - Heat slowly to remove moisture and to demagnetize the metallic material.
(6) - View under a 50-200x microscope lens.
See Photo 2 above with magnetized metallic debris.
Note: when you collect the sample, the sample itself becomes somewhat magnetized. So, while you can put the sample under a microscope and check what you have (I found many spheres in between metallic debris), you can improve the sample and get rid of almost all the magnetized, metallic debris by heating it to a high temperature à ‚¬" and removing water at the same time.
Put the sample in a test tube and gradually heat it, but not too fast as it may crack the glass. Heating randomizes the iron atoms and the substance loses its magnetism, or most, and the sample becomes easier to manipulate.
Put the cooled sample on a flat surface, a porcelain plate works fine, and gently tap the plate which gradually sorted the spheres at the bottom. ((For ex-hippies, this technique should be familiar if only for a different, more à ‚¬Ëœrecreational' purpose"!! ))
Those small round, barely visible spheres that collect at the bottom are what you see in the Photo 3 above à ‚¬" a line of demagnetized microspheres.
I encourage you to try it, if only to show yourself what it is that coal-burning coal plants contaminate our air, our land, our water and just how widespread and prevalent are the particles" Do your own checking around, get samples from different sources.
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