Black aperture of karst sinkhole, formed above abandoned limestone mine. Diameter about 15 ft, depth about 40-50 ft. Forming process is still going on
Schlüsselwörter
sink,
sinkhole,
hole,
pit,
danger,
abyss,
area,
below,
black,
cave,
cavity,
chalk,
chasm,
crumbled,
deep,
depression,
depth,
dolomite,
drainage,
earth,
extreme,
force,
geology,
great,
ground,
gypsum,
huge,
karst,
karstic,
kazan,
landscape,
limestone,
massive,
nature,
precipice,
relief,
russia,
stone,
structure,
surface,
texture,
underground,
underwater,
village,
water
Deutsch
