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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from The Underground City by Jules Verne: completely changed into coal. So then, the origin of coal mines,
in whatever part of the globe they have been discovered, is this:
the absorption through the terrestrial crust of the great forests
of the geological period; then, the mineralization of the vegetables
obtained in the course of time, under the influence of pressure and heat,
and under the action of carbonic acid.
Now, at the time when the events related in this story took place,
some of the most important mines of the Scottish coal beds had
been exhausted by too rapid working. In the region which extends
between Edinburgh and Glasgow, for a distance of ten or twelve miles,
lay the Aberfoyle colliery, of which the engineer, James Starr,
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