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Question
Assertion (A): Igneous rocks are called primary rocks.
Reason (R): They were the first to be formed.
Options
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.
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Solution
Both A and R are true, and R is the correct explanation of A.
Explanation:
Igneous rocks are called primary rocks because they were the first to be formed on the earth. These rocks originate directly from the cooling and solidification of molten magma or lava, forming the earliest solid crust of the earth. This makes them the “parent” or “primary” rocks from which other rock types, like sedimentary and metamorphic rocks, are derived. Therefore, both the assertion and the reason are true, and the reason correctly explains why igneous rocks are called primary rocks.
