igneous rock encyclopedia of earth

Igneous Rocks | Encyclopedia.com

Igneous rocks. The first rocks on Earth were igneous rocks. Igneous rocks are formed by the cooling and hardening of molten material called magma.The word igneous comes from the Latin word ignis, meaning fire.There are two types of igneous rocks: intrusive and extrusive.

Igneous rock - Encyclopedia Britannica | Britannica.com

Igneous rock, any of various crystalline or glassy rocks formed by the cooling and solidification of molten earth material. Igneous rocks constitute one of the three principal classes of rocks, the others being metamorphic and sedimentary. Igneous rocks are formed from the solidification of magma, which is a hot (600 to 1,300 °C, or 1,100 to 2,400 °F) molten or partially molten rock material.

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Igneous rock - Intrusive igneous rocks | Britannica.com

Igneous rocks, which are formed by the cooling of molten masses of mineral as they approach the Earth’s surface, include granite, diorite, basalt, and obsidian. These are some of …

Rock (geology) - Wikipedia

Igneous rocks are divided into two main categories: Plutonic or intrusive rocks result when magma cools and crystallizes slowly within the Earth's crust. A common example of this type is granite. Volcanic or extrusive rocks result from magma reaching the surface either as lava or fragmental ejecta, forming minerals such as pumice or basalt.

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Igneous rock - Wikipedia

Intrusive igneous rocks are formed from magma that cools and solidifies within the crust of a planet, surrounded by pre-existing rock (called country rock); the magma cools slowly and, as a result, these rocks are coarse-grained.

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The Encyclopedia of Igneous and Metamorphic Petrology ...

Featuring over 250 contributions from more than 100 earth scientists from 18 countries, The Encyclopedia of Igneous and Metamorphic Petrology deals with the nature and genesis of igneous rocks that have crystallized from molten magma, and of metamorphic rocks that are the products of re-crystallization associated with increases in temperature and pressure, mainly at considerable depths in the Earth's …

Igneous Rocks: Everything You Need to Know

In many igneous rocks, large mineral crystals "float" in a fine-grained groundmass. The large grains are called phenocrysts, and a rock with phenocrysts is called a porphyry; that is, it has a porphyritic texture.

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