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Igneous rocks are the types of rock goes back to millions years ago and they derive of intense underground heat and of the solidification of the lave.
The most important material derived by igneous rock is granite. Granite is a material very durable and water resistant.
Sedimentary rocks are the result of sediments of other rock. this material is deposited by winds and waters. Limestone and sandstone are the material derivation by sedimentary rocks. In these stones, there are often fossilized plant and animals remains. The difference between limestone and sandstone is that sandstone is harder and more resistant to pollution than limestone.
Metamorphic rocks are formed by transformation of igneous and sedimentary rocks. Slate and marble are metamorphic rocks. This types of metamorphic rock are trained by chemical process. Marble has a different color and it is used for decorative purposes.

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