Question:
Which of the following is a sedimentary rock?
Which of the following is a sedimentary rock?
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Sedimentary rocks like chalk, sandstone, and limestone are formed from the deposition and compaction of sediments, while igneous and metamorphic rocks form from magma or alteration of existing rocks.
Updated On: Aug 29, 2025
- Amphibolite
- Chalk
- Gabbro
- Schist
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The Correct Option is B
Solution and Explanation
- Rocks are classified into three main types: igneous, sedimentary, and metamorphic.
- Amphibolite is a metamorphic rock, formed mainly from the metamorphism of basalt or gabbro. Hence, (A) is incorrect.
- Chalk is a sedimentary rock composed mainly of calcium carbonate (CaCO3), formed from the skeletal remains of microscopic marine organisms like foraminifera and coccolithophores. Thus, (B) is correct.
- Gabbro is an intrusive igneous rock, coarse-grained, formed from the slow cooling of magma beneath the Earth's surface. Hence, (C) is incorrect.
- Schist is a metamorphic rock, characterized by foliated layers due to high temperature and pressure. Thus, (D) is incorrect.
- Amphibolite is a metamorphic rock, formed mainly from the metamorphism of basalt or gabbro. Hence, (A) is incorrect.
- Chalk is a sedimentary rock composed mainly of calcium carbonate (CaCO3), formed from the skeletal remains of microscopic marine organisms like foraminifera and coccolithophores. Thus, (B) is correct.
- Gabbro is an intrusive igneous rock, coarse-grained, formed from the slow cooling of magma beneath the Earth's surface. Hence, (C) is incorrect.
- Schist is a metamorphic rock, characterized by foliated layers due to high temperature and pressure. Thus, (D) is incorrect.
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