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- The three types of igneous rocks are12:
- Intrusive (Plutonic) Igneous Rocks: These rocks form from magma that cools and solidifies beneath the Earth’s surface.
- Extrusive (Volcanic) Igneous Rocks: These rocks form from lava that erupts onto the Earth’s surface.
- Pyroclastic Igneous Rocks: These rocks are formed from volcanic ash, dust, and debris that are ejected during explosive volcanic eruptions.
Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.Here’s a basic overview of the classification:
- 1. Intrusive (Plutonic) Igneous Rocks: These rocks form from magma that cools and solidifies beneath the Earth’s surface. ...
geologyscience.com/rocks-2-2/igneous-rocks/Because of the importance of silica content, it has become common practice to use this feature of igneous rocks as a basis for subdividing them into the following groups: silicic or felsic (or acid, an old and discredited but unfortunately entrenched term), rocks having more than 66 percent silica; intermediate, rocks with 55 to 66 percent silica; and subsilicic, rocks containing less than 55 percent silica.www.britannica.com/science/igneous-rock - People also ask
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