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ROCKS AND ROCK CYCLE — Geography STD 9 — Question

ICSE BoardEnglish MediumSTD 9GeographyROCKS AND ROCK CYCLE2 Marks
Question
Critical thinking question:
Tina has been given two samples of igneous rocks. She gets a smooth feeling when touches the sample A and gets a rough feeling when she touches the sample B. How can she understand whether sample A and B are extrusive or intrusive igneous rock?
✓

Answer

Sample A is Extrusive and sample B is intrusive igneous rock.
Reason: Extrusive rocks have finer crystals as it cools in rapid rate but intrusive rocks have coarser crystals as their cooling rate is slow.

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