Which statement about igneous rocks is true?Group of answer choicesPyroclastic rocks are types of intrusive rocksGlassy textures are formed when magma cools very slowlySiO2-poor magmas are more explosive than SiO2-rich magmasIntrusive rocks are also known as plutonic rocks
Question
Which statement about igneous rocks is true?Group of answer choicesPyroclastic rocks are types of intrusive rocksGlassy textures are formed when magma cools very slowlySiO2-poor magmas are more explosive than SiO2-rich magmasIntrusive rocks are also known as plutonic rocks
Solution
The statement about igneous rocks that is true is: "Intrusive rocks are also known as plutonic rocks."
Here's why:
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Pyroclastic rocks are not types of intrusive rocks. They are actually extrusive rocks formed from volcanic activity.
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Glassy textures in rocks are not formed when magma cools very slowly. They are formed when magma cools very quickly, not allowing time for mineral crystals to grow.
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SiO2-poor magmas are not more explosive than SiO2-rich magmas. It's actually the opposite. SiO2-rich magmas are more viscous and tend to be more explosive.
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Intrusive rocks are indeed also known as plutonic rocks.
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