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What are some facts about rocks?

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Rock is the primary component of the Earth's crust. Although soil, sand and other natural materials are similar to rocks, they are not actually rocks and are classified as derivatives of rocks. Minerals are necessary to form nearly all types of rock, and most include more than one mineral. Metals are also found in many rock types.

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There are three classes of rock and they are all formed in different ways. Igneous rock is created by the cooling of a molten mixture of minerals called magma. Magma is found below the earth's crust. When the magma cools below the Earth's surface, the rocks that are formed are called intrusive, and when it cools above the Earth's surface, they are extrusive rocks.

Sedimentary rock is created from loose material, such as sand, pebbles, mud and even pieces of organic matter. Sediments are loose materials that are moved from one place to another. Sediment becomes rock after millions of years of pressure and chemical action.

The final type of rock is metamorphic rock, which forms under the Earth's surface through the alteration of existing sedimentary or igneous rocks. These alterations can be caused by pressure, chemical reactions, movement of the Earth's crust, heat and pressure.

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    What are some facts about igneous rocks?

    A:

    Some facts about igneous rocks include that they are glassy in nature, that pumice igneous rock is the lightest type of rock on Earth, and that the moon is made of igneous rocks. Igneous rocks come from molten magma and have two main versions: basalt and pumice.

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    Why are rocks important?

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    Rocks are important because geologists use evidence from them to learn about what the Earth was like in the past. They allow scientists to build a historical record of the planet to learn what events occurred before people lived.

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    How are rocks different from minerals?

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    Rocks are different from minerals in that minerals are single crystalline accumulations of one or more elements, while rocks are solid accumulations of one or more minerals. Rock can either refer to a particular, detached object or, in a general sense, as a synonym for stone, generally referring to a portion of the substance. Individual minerals can be obvious in rocks, as with granite, or microscopic, as with many basalts.

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