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Geography [2 Mark Question Answer]

ROCKS AND ROCK CYCLE · ICSE STD 9 (ICSE - English Medium). 20 questions.

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[2 Mark Question Answer]

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20 questions · timed · auto-graded

Question 12 Marks
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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Question 22 Marks
Critical thinking question:
Rina has the hobby of collecting different stones from different areas wherever she travels. Those stones are having different colour and texture. Some are hard and some are soft. What is the reason for such difference?
Answer
The structure, texture, colour and hardness depend on the nature of formation of the rocks and their mineral composition. As the rocks are formed by different processes therefore, they have different characteristics.
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[2 Mark Question Answer] - Geography STD 9 Questions - Vidyadip