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6 October, 04:53

Extrusive igneous rock

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  1. 6 October, 07:21
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    Extrusive Igneous Rocks. Extrusive igneous rocks form when magma reaches the Earth's surface a volcano and cools quickly. Most extrusive (volcanic) rocks have small crystals. Examples include basalt, rhyolite, andesite, and obsidian.
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