Science Fair Project Encyclopedia
Lapilli
Lapilli are small particles of solidified lava (tephra) thrown into the air by volcanic eruptions.
In addition to accretionary lapilli, there is another kind of volcanic lapilli that are spheroid, teardrop, dumbbell, or button shaped. These granules are not accretionary, but are the direct result of liquid rock cooling as it travels through the air. This type of pyroclastic debris ranges in size from a few millimeters to several centimeters.
10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details