2.1 Earth as a Systom: The Rock Cycle 47 ROCK CYCLE Viewed over long time spans, rocks are constantly forming, changing, and re-forming. Extrusive When magma or lava cools and solidifies, Igneous rock forms. Igneous Rock Lava USGS USGS Col ing, crystallization Magma Intrusive Magma forms when rock melts deep beneath Earth's surface. Melting EJ. Tarbuck Igneous Rock Weathering breaks down rock that is transported and deposited as sediment. a wathering, ransporation, and depositen Metamorphic Rock Metamerptis m Sediment Heat Metamorphism theat, intense gr es sure) Mela mer Lithi ficati on When sedimentary rock is burled deep In the crust, heat and pressure (stress) change It to metamorphic rock. Sediment is compacted and cemented to form sedimentary rock. Demis Ta SmartFigure 2.1 The rock cycle The rock cycle helps us understand the origins of the three basic rock groups. Arrows represent processes that link each group to the others. (https/ligoo.gvawWRSL) Sedimentary Rock Demis Taa Tutorial Weathering transport, deposition Melting

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