Igneous rocks contain randomly arranged interlocking crystals. The size of the crystals depends on how quickly the molten magma solidifies and can form extrusive igneous rocks or intrusive igneous ...
ZME Science on MSN5mon
What are thundereggs? The rare, chalcedony-filled rocksThis process can occur either below the Earth’s surface, forming intrusive or plutonic igneous rocks like granite, or at the ...
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