QuestionMay 17, 2025

8. Explain why andesite and diorite can both have the same percentage of mineral composition by volume, and yet be two different igneous rocks. __ 1 point

8. Explain why andesite and diorite can both have the same percentage of mineral composition by volume, and yet be two different igneous rocks. __ 1 point
8. Explain why andesite and diorite can both have the same percentage of mineral composition by volume, and yet be two different igneous rocks. __ 1 point

Solution
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Answer

Andesite and diorite differ due to their cooling rates and resulting textures, despite having similar mineral compositions. Explanation 1. Identify Rock Types Andesite is an extrusive igneous rock, while diorite is intrusive. 2. Explain Formation Process Extrusive rocks like andesite cool quickly on the Earth's surface, resulting in fine-grained textures. Intrusive rocks like diorite cool slowly beneath the surface, leading to coarse-grained textures. 3. Relate Texture to Mineral Composition Both rocks can have similar mineral compositions (e.g., plagioclase, amphibole), but their cooling rates affect crystal size and texture, distinguishing them.

Explanation

1. Identify Rock Types<br /> Andesite is an extrusive igneous rock, while diorite is intrusive.<br /><br />2. Explain Formation Process<br /> Extrusive rocks like andesite cool quickly on the Earth's surface, resulting in fine-grained textures. Intrusive rocks like diorite cool slowly beneath the surface, leading to coarse-grained textures.<br /><br />3. Relate Texture to Mineral Composition<br /> Both rocks can have similar mineral compositions (e.g., plagioclase, amphibole), but their cooling rates affect crystal size and texture, distinguishing them.
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