Lab 4 - R ocks t he solid materials that comprise most of...

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Rocks – the solid materials that comprise most of Earth, our Moon, and the other rocky planets of our solar system. Nearly all rocks are solid aggregates of mineral grains, either mineral crystals or clasts (broken pieces.) of mineral crystals and rocks. Obsidian is a rock made of volcanic glass and Coal is a rock made of plant fragments. Igneous rocks – form when magma or lava cool to solid form, either glass or masses of tightly intergrown mineral crystals. Sedimentary rocks – form mostly when mineral crystals and clasts of plants, animals, and mineral crystals or rocks are compressed or naturally cemented together. They also form when mineral crystals precipitate from water to form a rocky mass such as rock salt or cave stalactites. Metamorphic rocks – rocks deformed or changed from one form to another (transformed) by intense heat, intense pressure, and/or the action of hot fluids. Rock cycle – the model explains how all rocks can be formed, deformed,
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