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Dacite-ThinSection-USGS.jpg(600 × 480 pixels, file size: 102 KB, MIME type: image/jpeg)


Thin section image in crossed polars of a Dacite sample from a dome in Mount St. Helens. Image by United States Geological Survey, a federal scientific agency.


The following pages on Schools Wikipedia link to this image (list may be incomplete):

Schools Wikipedia and SOS Children

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