Rock+Practice+Pics

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 * __Answer Key__**
 * 1) 1-Slate
 * 2) 2-Basalt
 * 3) 3-Shale
 * 4) 4-Gneiss
 * 5) 5-Scoria
 * 6) 6-Coal
 * 7) 7-Schist
 * 8) 8-Conglomerate
 * 9) 9-Sandstone
 * 10) 10-Granite
 * 11) 11-Rhyolite
 * 12) 12-Gabbro
 * 13) 13-Quartzite
 * 14) 14-Limestone
 * 15) 15-Pumice
 * 16) 16-Marble
 * 17) 17-Obsidian