Civil Services 71st BPSC CCE (Preliminary) Test Series 2025 General Knowledge Geography (World Geography) Geomorphology

পৃথিবীর ভূত্বকে সিলিকনের আনুমানিক শতাংশ কত?

1
0.25%
2
2.5%
3
২৫%
4
৩৫%
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