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Physics 8 Online
OpenStudy (anonymous):

Which of the following is not considered to be a rock? coal sandstone pumice lava

OpenStudy (anonymous):

Lava. The reason being the others are all solid, but lava is liquid. While lava is rock in molten form, true rocks as per the definition of a rock, will be solid. recall that the definition of a rock is a solid aggregate of minerals and/or mineraloids.

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