झारखंड की कोयला खदानों ने की लंबे समय से खोई हुई दुनिया को फिर से खोजने में मदद: Open cast coal mines in Jharkhand have provided evidence of a lost ecosystem that existed much before humans or even dinosaurs existed. Evidence buried in the mines helped retrace the dense swampy forests and network of rivers that prevailed in India which formed part of the southern supercontinent Gondwanaland, nearly 300 million years ago. Chemical
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