Discussion
Consider the statements A, B, C on metamorphic rocks and choose the correct answer :
A. When igneous and sedimentary rocks are subjected to heat and pressure they change to metamorphic rocks.
B. Metamorphic rocks melt to form molten magma when subjected to great heat and pressure.
C. Marble is a metamorphic rock.
Answer: C
The answer is A, B, C all are correct.
NCERT's account of the rock cycle says that igneous and sedimentary rocks change into metamorphic rocks under great heat and pressure (A), and that metamorphic rocks still under great heat and pressure melt down to form molten magma, from which igneous rocks form again (B). Marble, formed from limestone, is a standard example of a metamorphic rock, as slate is from clay (C).
Since all three statements describe the cycle correctly, each option that marks one of them incorrect is wrong.
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