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by Stratigraphy.net
New from Snet: Lithologs, a new tool to create lithological/sedimentological logs online..

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Which of These Rocks, Mostly from Glass Mountain, CA, Will Float

I've gathered up a collection of rocks to see which ones will float and which ones will sink. All but one of these are glassy volcanic rocks from Glass Mountain in northeastern California. The ones from Glass Mountain are all rhyolitic. This test is a follow on to a short discussion in the comment section of a recent post, resulting in two questions we can ask about the six rocks I've set on

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