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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: of the sun as by the fires of the interior mass. The internal
heat had not as yet been collected in the center of the globe.
The terrestrial crust, thin and incompletely hardened, allowed it
to spread through its pores. This caused a peculiar form of vegetation,
such as is probably produced on the surface of the inferior planets,
Venus or Mercury, which revolve nearer than our earth around
the radiant sun of our system.
The soil of the continents was covered with immense forests.
Carbonic acid, so suitable for the development of the vegetable
kingdom, abounded. The feet of these trees were drowned in a sort
of immense lagoon, kept continually full by currents of fresh
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