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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Rahul kumar Best Answer
Correct answer should be b and d See the attached figure below. In left image; A, B, C are minerals; line AC and A'C' are isochrones. You can note that slope of isochrone is positive. You can also observe the evolution path of Isotopes in mineral. Evolution paths (A-->A'; B-->B' and C-->C') are showing negative but equal (parallel). So, option B and D are correct.