What term is used for extrusive rocks that have crystals or grains too small to be visible without magnification?

Soil Science MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

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Subject
Soil Scienceagriculture-mcqs › soil-science
Published
6 Jul 2021
Last updated
28 May 2026

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Explanation

Extrusive rocks, which solidify quickly on the Earth's surface, often have a very fine-grained texture. When the individual mineral crystals are too small to be seen with the naked eye, these rocks are called aphanitic rocks.

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