IIT JAM Exam > IIT JAM Questions > In general, igneous rocks :a)form at relative...
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In general, igneous rocks :
- a)form at relatively high temperatures
- b)form by crystallization of solids from a liquid
- c)is formed by compaction and cementing of layers
- d)all of the above
Correct answer is option 'A,B'. Can you explain this answer?
Most Upvoted Answer
In general, igneous rocks :a)form at relatively high temperaturesb)for...
Understanding Igneous Rocks
Igneous rocks are a fundamental category of rocks that form through the cooling and solidification of molten material. Here’s a detailed explanation of the characteristics of igneous rocks:
Formation at High Temperatures
- Igneous rocks form at relatively high temperatures, typically between 700°C to 1,200°C.
- This high-temperature formation is due to the molten rock, or magma, originating from the Earth's mantle or crust.
Crysalization from Liquid
- The process of crystallization is crucial in the formation of igneous rocks.
- As magma cools, it begins to solidify, allowing minerals to crystallize out of the liquid phase.
- This results in a variety of mineral compositions, leading to different types of igneous rocks such as granite and basalt.
Why Options C and D are Incorrect
- Option C refers to the process of compaction and cementing of layers, which is characteristic of sedimentary rocks, not igneous rocks.
- Option D, therefore, cannot be correct as it includes C, which does not apply to igneous rock formation.
Conclusion
In summary, the correct characteristics of igneous rocks are encapsulated in options A and B, emphasizing their formation at high temperatures and through the crystallization of solids from a liquid. This understanding is crucial for geology and earth sciences, especially in contexts like the IIT JAM examination.
Igneous rocks are a fundamental category of rocks that form through the cooling and solidification of molten material. Here’s a detailed explanation of the characteristics of igneous rocks:
Formation at High Temperatures
- Igneous rocks form at relatively high temperatures, typically between 700°C to 1,200°C.
- This high-temperature formation is due to the molten rock, or magma, originating from the Earth's mantle or crust.
Crysalization from Liquid
- The process of crystallization is crucial in the formation of igneous rocks.
- As magma cools, it begins to solidify, allowing minerals to crystallize out of the liquid phase.
- This results in a variety of mineral compositions, leading to different types of igneous rocks such as granite and basalt.
Why Options C and D are Incorrect
- Option C refers to the process of compaction and cementing of layers, which is characteristic of sedimentary rocks, not igneous rocks.
- Option D, therefore, cannot be correct as it includes C, which does not apply to igneous rock formation.
Conclusion
In summary, the correct characteristics of igneous rocks are encapsulated in options A and B, emphasizing their formation at high temperatures and through the crystallization of solids from a liquid. This understanding is crucial for geology and earth sciences, especially in contexts like the IIT JAM examination.
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