Geography
Assertion (A): Igneous rocks are called Primary rocks.
Reason (R): Igneous rocks are formed by the solidification of hot molten magma.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true and R is not the correct explanation of 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 not the correct explanation of A.
Explanation — Igneous rocks are indeed called Primary rocks because they are the first type of rocks to form on Earth and serve as the parent rocks for other types. The reason that they form from the solidification of molten magma is also true. However, this process explains their formation, not specifically why they are called Primary rocks. Hence, R is not the correct explanation of A.
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Related Questions
Which of the following process is responsible for the formation of igneous rocks?
- Sedimentation
- Metamorphism
- Cooling & solidification of magma
- Lithification
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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?
Assertion (A): Metamorphic rocks do not have fossils.
Reason (R): Metamorphic rocks are formed by the change of pre-existing rocks due to high heat and pressure.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true and R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.