Check the listing for details. Igneous Rock Collection - 12 Numbered Samples with ID List - Geology Education. Condition: Used. Listed at 19.99 USD. Igneous rocks are born from intense heat, forming directly from the cooling and solidification of molten rock (magma or lava). Magma is found beneath the Earth's surface, and its slow cooling creates intrusive igneous rocks with large crystals (like granite).
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