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Physics 22 Online
OpenStudy (anonymous):

Why can two igneous rocks have the same minerals but different names?

OpenStudy (zairahernandez):

The common usage of "lava rock" in the USA refers to a black rock with a number of visible bubbles or air pockets that is formed from cooled lava on the surface. Although lava rock is an igneous rock, it is not the same as the definition for the word igneous, which can also include igneous rocks which have solidified from magma below the surface.

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