chapter 2 પાઠ 2 પૃથ્વીનો ઉદ્ભવ અને ઉત્ક્રાંતિ
ભાગ 1 https://www.youtube.com/watch?v=9ZRKTS5N1Vw
ભાગ 2 https://www.youtube.com/watch?v=tiEQSg6MIiU
ભાગ 3 https://www.youtube.com/watch?v=I77KRdIXLG0
ભાગ 4 https://www.youtube.com/watch?v=G6R5-B_O0NY
ભાગ 5 https://www.youtube.com/watch?v=8AN4NZyJiH4
ભાગ 6 https://www.youtube.com/watch?v=prX8NrwWiB8
ભાગ 7 https://www.youtube.com/watch?v=qaXCH_cm1x0
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