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Exploring the World of Rock: Formation and Uses

Discover the fascinating realm of rocks, from the rock cycle to how they are used in tools, buildings, and more. Uncover the science behind igneous, sedimentary, and metamorphic rocks, and learn about rock classification based on composition and texture.

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Exploring the World of Rock: Formation and Uses

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  1. Chapter 4 Section 1 Understanding Rock

  2. Understanding Rock • Rock is simply a solid mixture of crystals of one or more minerals. • The rock cycle is the process by which one rock type changes into another. • Any of the major rock types can turn into any other type of rock or turn back into the same type of rock again • Some of the scalpels used today are made from obsidian.

  3. Understanding Rock • We use rock for tools, buildings, decoration, roads, sidewalks, and many other things. • Magma is a hot liquid that forms when rock partially or completely melts (underground) • Igneous rock is magma or lava that cools and solidifies • Sedimentary rock is rock that forms from rock sediments that are compacted and cemented together

  4. Understanding Rock • Metamorphic Rock is rock that forms when the texture and composition of a preexisting rock is changed by heat or pressure deep underground

  5. The Nitty-Gritty on Rock Classification • Composition is the minerals a rock is made of • Texture is determined by the size, shapes, and positions of the grains of which it is made of.

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