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3 main categories of rocks

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The three main types, or classes, of rock are sedimentary, metamorphic, and igneous and the differences among them have to do with how they are formed. Sedimentary rocks are formed from particles of sand, shells, pebbles, and other fragments of material. Together, all these particles are called sediment.

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By: Cloyie L. Delos Santos

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• Is usually magma, a molten material from deep within the earth that cools and hardens.

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Texture • Relates to general appearance of an igneous rocks. Composition • Refers to the elements in the magma that directly affect the kind

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3 main categories of rocks

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Types of igneous rocks scoria

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When igneous rocks are exposed at the surface, they begin to wear away. Sandstone

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Clastic sedimentary rocks Chemical sedimentary rocks Organic sedimentary rocks 3 Main types of sedimentary rocks:

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Earth movements can cause rocks to be pressed, bent or deeply buried under layers of the rocks.

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3 main categories of rocks

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Rock cycle Weather and erosion Heat and pressure Heat and pressure Sedimentary rocks Metamorphic rocks magma meltin g Compacting and cementing Weather and erosion meltin g cooling Igneous rockssediment Weather and erosion

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3 main categories of rocks

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3 main categories of rocks