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Word Definition Igneous Rock Formed through cooling and solidification of magma or lava Sedimentary rock Formed from fragments of other rocks-compressed and cemented layers Metamorphic rock Forms when any type of rock is exposed to heat and pressure Magma Hot liquid rock below or within Earth’s surface Lava Melted rock from a volcano on Earth’s surface Weathering Breaking down of rocks and minerals. Causes: water, air, ice, plants, animals, temperature Sediment Composed of rock fragments, material dissolved in water, biological debris (fragments from something destroyed) Erosion Process that moves sediment from one place to another. Water, wind, ice, and gravity cause erosion. Deposition Process in which sediment is laid down or dropped Sentence Picture Compaction Process in which sediment is closely packed together Cementation Process in which sediments are glued together by minerals Pressure Process of squeezing, pressing or pushing rocks together