Geography
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 igneous rocks cool quickly on the Earth's surface, resulting in fine-grained, smooth textures. In contrast, intrusive igneous rocks cool slowly beneath the surface, allowing larger crystals to form, which gives them a rougher texture.
Related Questions
Which of the following process is responsible for the formation of igneous rocks?
- Sedimentation
- Metamorphism
- Cooling & solidification of magma
- Lithification
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?
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.
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.