How Does igeneous rocks formed and why do their size vary ?
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If the cooling of the lava happened more slowly, the rocks would be fine-grained or porphyritic – where the crystals differ in size, with at least one group of crystals obviously larger than another group. Basalt is a common form of extrusive igneous rock and forms lava flows, lava sheets and lava plateaus.
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If the cooling of the lava happened more slowly, the rocks would be fine-grained or porphyritic – where the crystals differ in size, with at least one group of crystals obviously larger than another group. Basalt is a common form of extrusive igneous rock and forms lava flows, lava sheets and lava plateaus.
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