| pumice |
A type of lava that is porous and mostly glass. In solid form, it is used in powdered forms as an abrasive.
출처: sherpaguides.com/california/mountains/appendices/g...
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|---|---|
| pumice |
A fine pumice powder used in the polishing process. Usually available in 90 and 180 grades.
출처: www.pledge.co.uk/ref/ch12c.htm
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| pumice |
A light-colored volcanic rock that contains a large number of vesicles and has a composition similar to rhyolite.
출처: www.geologyeducation.com/hazardcity/Files/misc/glo...
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| pumice |
Volcanic glass, used in powdered form as pounce on parchment; in its consilidated form, it was employed to scrape parchment for reuse as a palimpsest.
출처: www.ceu.hu/medstud/manual/MMM/glossary.html
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| pumice |
Frothy volcanic rock formed by the expansion of gas in erupting lava.
출처: lvo.wr.usgs.gov/Terms.html
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