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This activity is perfect for students studying rocks. Simply click on a rock in the rock chart to learn all about it. Learn bout igneous rocks such as obsidian, basalt, granite, pumice, rhyolite, and andecite; metamorphic rocks such as marble, slate, gneiss, schist, anthracite, and quartzite; and sedimentary rocks such as sandstone, limestone, conglomerate, shale, travertine, and dolomite.