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OpenStudy (anonymous):
Which of the following is not considered to be a rock? coal sandstone pumice lava
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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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