Geography
Assertion (A): Igneous rocks are called primary rocks.
Reason (R): They were the first to be formed.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R does not explain A.
- A is true but R is false.
- A is false but R is true.
Rocks
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Answer
Both A and R are true and R is the correct explanation of A.
Explanation — Since the igneous rocks were the first to be formed, they are called primary rocks. They form the basis of formation of other types of rocks.
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Related Questions
Transported sediments get deposited in layers leading to increased pressure and temperature on the lower layers. Select the correct sequence of processes involved in the lithification of these sediments.
- Compaction — Evaporation — Cementation.
- Evaporation — Compaction — Cementation.
- Evaporation — Cementation — Compaction.
- Evaporation — Dehydration — Cementation.
Sam was working under a geologist. He lost his balance and dropped the bags containing igneous rocks and sedimentary rocks and the rocks got mixed. How would he separate them?
- Igneous rocks are hard.
- Igneous rocks are crystalline.
- Sedimentary rocks have strata showing layers.
- Sedimentary rocks are soft.
The rocks like peat, lignite, bituminous and anthracite are example of:
- Igneous rocks
- Mechanical rocks
- Metallic rocks
- Carbonaceous rocks
The following pairs are the types of rocks on the basis of agents of their formation. Which of the following is incorrect?
- Lacustrine : lake beds
- Aeolian : sand particles
- Glacial : ocean floor
- Riverine : flowing waters of rivers.