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  1. www.britannica.com › science › igneous-rockIgneous rock | Characteristics, Examples, Formation, & Types

    Jun 26, 2024 · 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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  3. sciencenotes.org › igneous-rocks-types-propertiesIgneous Rocks - Types, Properties, and Examples

    Jan 31, 2024 · The classification of igneous rocks based on composition revolves around the silica (SiO 2) content and the proportion of various minerals present in the rock. This classification categorizes igneous rocks into four primary groups: felsic, intermediate, mafic, and ultramafic.

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    • 3 Types of Rock: Igneous, Sedimentary & Metamorphic | AMNH
    • Types of Rocks - Igneous, Sedimentary, Metamorphic
    • PPT - How the Earth’s Rocks Were Formed PowerPoint Presentation, free ...
    • Igneous rock explained with its types and textures

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  5. en.wikipedia.org › wiki › Igneous_rockIgneous rock - Wikipedia

    Igneous rock (igneous from Latin igneus 'fiery'), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rocks are formed through the cooling and solidification of magma or lava. The magma can be derived from partial melts of existing rocks in either a planet's mantle or crust.

  6. sciencenotes.org › types-of-rocks-igneousTypes of Rocks - Igneous, Sedimentary, Metamorphic

    Jul 9, 2023 · The three major types are igneous, sedimentary, and metamorphic rocks. This classification is essential to geologists as it provides critical information about the history of specific regions on Earth. These rocks change forms via the rock cycle.

  7. www.thoughtco.com › igneous-rock-types-4122909Pictures and Descriptions of Igneous Rock Types - ThoughtCo

    • Andrew Alden
    • Andesite. Andesite is an extrusive igneous rock that is higher in silica than basalt and lower than rhyolite or felsite. Click the photo to see the full-size version.
    • Anorthosite. Anorthosite is an uncommon intrusive igneous rock consisting almost entirely of plagioclase feldspar. This is from New York's Adirondack Mountains.
    • Basalt. Basalt is an extrusive or intrusive rock that makes up most of the world's oceanic crust. This specimen erupted from Kilauea volcano in 1960. Basalt is fine grained so the individual minerals are not visible, but they include pyroxene, plagioclase feldspar, and olivine.
    • Diorite. Diorite is a plutonic rock that is between granite and gabbro in composition. It consists mostly of white plagioclase feldspar and black hornblende.

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  9. www.nationalgeographic.org › igneous-rocksIgneous Rocks - National Geographic Society

    Oct 19, 2023 · The two main categories of igneous rocks are extrusive and intrusive. Extrusive rocks are formed on the surface of the Earth from lava, which is . magma that has emerged from underground. Intrusive rocks are formed from magma that cools and solidifies within the crust of the planet.

  10. openoregon.pressbooks.pub › earthscience › chapter4.3 Classification of Igneous Rocks – Principles of Earth Science

    Igneous rocks can be divided into four categories based on their chemical composition: felsic, intermediate, mafic, and ultramafic. The diagram of Bowen’s reaction series ( Figure 4.6) shows that differences in chemical composition correspond to differences in the types of minerals within an igneous rock.