Igneous Rocks: made by cooling of molten rock, can be intrusive or extrusive, examples: obsidian, granite, basalt, rocks may have interlocking crystals, Metamorphic Rocks: made from other rocks that undergo extreme heat and pressure, examples: marble, gneiss, schist, rocks may have bands of minerals, rocks may have "layers" that have been bent, Sedimentary Rocks: made by cementation, made by compaction, examples: sandstone, limestone, conglomerate, rocks may have layers of small grains,

Types of Rocks

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