The variety of coal in which the deposit contains recognisable traces of the ori

The variety of coal in which the deposit contains recognisable traces of the original plant material is

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3) According to Avogadro's Hypothesis, the smallest particle of an element or a compound, that can exist independently, is called ____ .

4) The age of most ancient geological formations is estimated by

5) The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of