86 slide PowerPoint on igneous, sedimentary, and metamorphic rocks. See preview! Starting with the rock cycle, the PowerPoint first focuses on igneous rocks and how to identify them based on the following properties: formation environment (intrusive versus extrusive), crystal habit, texture (coarse, fine, or glassy), mineral composition, and color. Rocks addressed are granite, basalt, gabbro, rhyolite, obsidian, pumice, diabase/diorite, and scoria. The PowerPoint then focuses on sedimentary