With reference to the minerals and rocks, which of the following statements is correct?a)Basalt is a common plutonic rock.b)Acidic igneous rocks are denser and darker in colour than basic igneous rocks.c)Rock banding is a salient feature of metamorphic rocks.d)Half of the earths crust minerals are amphiboles.Correct answer is option 'C'. Can you explain this answer?

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With reference to the minerals and rocks, which of the following statements is correct?

a)
Basalt is a common plutonic rock.
b)
Acidic igneous rocks are denser and darker in colour than basic igneous rocks.
c)
Rock banding is a salient feature of metamorphic rocks.
d)
Half of the earth's crust minerals are amphiboles.

Correct answer is option 'C'. Can you explain this answer?

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With reference to the minerals and rocks, which of the following state...

Igneous rocks are formed by the cooling and solidification of molten rock (magma) from beneath the earth's crust. They are normally crystalline in structure. They do not occur in strata layers nor do they contain fossils. Igneous rocks may be sub-divided on the basis of mineral composition.
When they contain a high proportion of silica they are said to be acid. Acid igneous rocks, such as granite, are less dense and are lighter in colour than basic rocks. These contain a greater proportion of basic oxides, e.g. of iron, aluminium or magnesium, and are thus denser and darker in colour.
Plutonic rocks: These are igneous rocks formed at some depth in the earth’s crust. They have cooled and solidified slowly so that large, easily-recognised crystals have been able to form. These intrusive rocks, such as granite, diorite and gabbro are exposed at the surface by the process of denudation and erosion. Basalt is a common volcanic or extrusive rock and forms lava flows, lava sheets and lava plateau, e.g. those of Antrim in Northern Ireland, the Deccan Plateau in India and the Columbiasnake Plateau in USA.
In the process of metamorphism in some rocks grains or minerals get arranged in layers or lines. Such an arrangement of minerals or grains in metamorphic rocks is called foliation or lineation. Sometimes minerals or materials of different groups are arranged into alternating thin to thick layers appearing in light and dark shades. Such a structure in metamorphic rocks is called banding and rocks displaying banding are called banded rocks. Hence option (c) is the correct answer.
Aluminium, calcium, silica, iron, magnesium are the major elements of amphiboles. They form 7 per cent of the earth's crust. It is in green or black colour and is used in asbestos industry. Hornblende is another form of amphiboles.

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Rock banding is a salient feature of metamorphic rocks.

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With reference to the minerals and rocks, which of the following statements is correct?a)Basalt is a common plutonic rock.b)Acidic igneous rocks are denser and darker in colour than basic igneous rocks.c)Rock banding is a salient feature of metamorphic rocks.d)Half of the earths crust minerals are amphiboles.Correct answer is option 'C'. Can you explain this answer?

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With reference to the minerals and rocks, which of the following statements is correct?a)Basalt is a common plutonic rock.b)Acidic igneous rocks are denser and darker in colour than basic igneous rocks.c)Rock banding is a salient feature of metamorphic rocks.d)Half of the earths crust minerals are amphiboles.Correct answer is option 'C'. Can you explain this answer? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about With reference to the minerals and rocks, which of the following statements is correct?a)Basalt is a common plutonic rock.b)Acidic igneous rocks are denser and darker in colour than basic igneous rocks.c)Rock banding is a salient feature of metamorphic rocks.d)Half of the earths crust minerals are amphiboles.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for With reference to the minerals and rocks, which of the following statements is correct?a)Basalt is a common plutonic rock.b)Acidic igneous rocks are denser and darker in colour than basic igneous rocks.c)Rock banding is a salient feature of metamorphic rocks.d)Half of the earths crust minerals are amphiboles.Correct answer is option 'C'. Can you explain this answer?.

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