What is the time required for the formation of young brown coals? – McqOptions

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1.	What is the time required for the formation of young brown coals?
A.	10<sup>7</sup> years
B.	3 10<sup>8</sup> years
C.	3 10<sup>9</sup> years
D.	10<sup>10</sup> years
Answer» B. 3 10<sup>8</sup> years

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