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In the presence of water vapor, calcite crystals (left columns) react with nitric acid to form liquid calcium nitrate particles (right columns). These electron microscopy images illustrate the formation of these new particles in laboratory-controlled experiments with commercial calcite powders (top) and in a sample of authentic dust (bottom), loess collected in a region of China where the loamy soil is high in calcium and particularly reactive.

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Document Title: Face-Changing Dust
Category: Atmospheric Sciences
Media Type: Photos
Date of Image/Photo: Summer 2004
Background:
URL of this page: http://picturethis.pnl.gov/picturet.nsf/by+id/AMER-67QNU7

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