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Igneous rock

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Igneous rock is rock which was at one point in a liquid state, or in other words was once magma, but which has since solidified. Igneous rocks are categorized by mineral composition as well as by the rock's crystal structure. Generally, rocks which have cooled quickly have finer, less developed crystals composing the rock, while rocks which have cooled slowly have had a chance to form larger crystals. The rate of cooling is often determined by whether the magma or lava cooled on the surface (extrusive) or under the ground (intrusive/plutonic).

Contents

Types of Igneous Rocks

Extrusive

Fast cooling, extrusive igneous rocks include:

Intrusive

Slow cooling, intrusive rocks include:

Related References

See Also


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