weathering, The process that breaks rocks down into smaller pieces, mechanical weathering, Physical forces that break rock without changing what it's made of, erosion, The process of moving broken pieces of rock (sediment) from one place to another by wind, water, ice, and gravity, chemical weathering , When rocks break down because of a chemical change., sediment, small pieces of material like sand, pebbles, shells, and mud that come from rocks and living things, compaction, The process where thick layers of sediment press down on the layers below, squashing them together, cementation, When dissolved minerals crystalize and "glue" the sediments together to form a solid rock, rock cycle, The ongoing process where rocks change from one type to another over millions of years, sedimentary rock, A rock formed when layers of sediment are pressed and glued together, detrital, Made from broken pieces of other rocks, organic, Made from things that were once alive like shells or ancient plants, igneous rock, A rock formed when melted rock (magma or lava) cools and hardens, intrusive , Igneous rock that forms inside Earth from magma. It cools slowly and has large crystals, extrusive, Igneous rock that forms on the Earth's surface from lava. It cools quickly and has very small crystals, metamorphic rock, Rock that has been changed by extreme heat and pressure deep underground. , magma, Molten (melted) rock found underground, lava, Molten rock that has reached the surface of the Earth.

Rock Cycle

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