Match the Rock Type to the Characteristics of its Formation KEY Sedimentary Rock Metamorphic Rock • Forms when molten rock (magma) cools and hardens. • Forms quickly on Earth’s surface when erupted from volcano. • Forms so quickly it has no crystals. • Looks shiny and glass-like or full of holes where air gas bubbles may have been trapped. • Examples: obsidian and basalt • Forms from small bits of sand, rock and shell. • Settles into layered rock over a very long period of time. • Forms fossils. • Can easily break up and crumble. • Examples: limestone, sandstone and conglomerate. Igneous Rock • Forms under great pressure. • Forms deep under the surface of the Earth. • Forms in extreme heat and pressure. • Forms in long ribbon-like layers. • Can form growths of crystals on the surface. • Examples: marble and gneiss.

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