Theme: geological wonder
Twenty Thousand Leagues under the Sea / Volcanic Ascent
The bottom now rose sensibly, and we soon arrived at long circuitous slopes, or inclined planes, which took us higher by degrees; but we were obliged ...
A Journey to the Centre of the Earth / Volcanic Exploration
Nevertheless, it appeared quite clear to me, that we were not in the principal chimney of the volcano, but in an accessory conduit, where we felt the ...