[EN]
The Bozkov Dolomite Caves are situated on the northern slope of
the Bozkov village in the hilly landscape of the Krkonose
foothills. The Bozkov dolomite caves, created in calcareous and
siliceous dolomites, is a labyrinth of underground corridors and
cavities situated not very deep under the surface. The typical and
unique decorations of the accessible caves consist in quartz ledges
and listels in walls and ceilings. Some of the hollows are even
filled with stalactites and stalagmites, including interesting
small eccentric stalactites and stalagmites, in addition to the
traditional calcite decoration. The whole length of space
discovered – 1050 meters and difference in altitude
(denivelation) of 43 meters – makes caves the longest system
in Czech republic.
The caves originated in the course of thousands of years with a
slow process of gradual solution of calcic dolomite of the
Paleozoic era. The development of subterranean carst shape was,
however, restricted by the area and thickness of the relatively
small dolomite lens, which is defined with the insoluble schistose
rocks (phylites) and is a part of discontinuous stripe of carst
(limestone) rocks, going through the Podkrkonosi region roughly in
the western-eastern direction. In the Quaternary era, some of the
formerly created free subterranean spaces were secondarily filled
with the deposits of sediments from the surface. It was at that
time that the current stalactite decoration came into existence.
Sightseeing route is 350 meters long and lasts about 45 minutes.
Attractive items of the sighseeing route also include underground
lakes with crystal-clear blue-greenish water. In Listopadova
jeskyne (‚November cave‘) you can find unique of nature
– the largest Czech underground lake – Jezerni dom
(‚Lake dom‘). During sightseeing the lights are
switched off for a while, except the lights inside the lake. In
twilight you can enjoy beauty of lake view.
The Bozkov dolomite caves is the only cave system in North Bohemia
accessible to the public. The caves and their surroundings is a
protected area conditioned by the nature and landscape protection
law.
To approve your log-in, please answer questions and complete the
task. Except the looking for answers you have to visit caves and
make a picture in certain place. Ticket and fee (for a camera) is
necessary then. I believe you won’t regret the visit.
1) DOLOMITE
a) Mention basic physical
properties of mineral – hardness, specific gravity (density)
and crystal system.
b) Explain the origin of the name
‘Dolomite’.
2) BOZKOV DOLOMITE CAVES
a) When have the caves
been discovered? (Year)
b) Average temperature inside the
caves? (Degrees Celsius)
3) PICTURE
Make a
‘self-picture’ (picture of you or your team) in two
given places – see added picture (you can look better of
course ;-)
Please add your picture in your log-in and answers send via my
profile.
I hope you’ll enjoy your visit just like over 2 million
other visitors to this day.
[CZ]
Bozkovske dolomitove jeskyne jsou nejseverneji polozenymi
zpristupnenymi jeskynemi v Ceske republice. Nachazeji se
v podhuri Krkonosv blizkosti vesnice Bozkov. Vznikly silnou
korozivni cinnosti podzemni vody v cockovitem telese vapnitych
dolomitu, metamorfovanych a misty silne prokremenelych. Vyznacuji
se neobvyklym rozsahem selektivni koroze sten a stropu. Jejich
vyzdobu tvori vedle krapniku unikatni kremenne listy a rimsy,
vystupujici ze sten a stropu. V nejnizsich castech jsou trvale
zaplaveny vodou vytvarejici podzemni jezera. Pred zpristupnenim
musely být hladiny podzemnich jezer snizeny o vice nez pet
metru. Svou celkovou delkou dosud objevenych prostor – pres
1050 m a s vyskovym rozpetim (denivelaci) 43 m - jsou
nejdelsimi dolomitovymi jeskynemi v Ceske republice.
Z celkove delky je zpristupneno je priblizne 350 metru chodeb,
pricemz samotny prohlidkový okruh trva priblizne 45 minut.
Uzas vyvolaji podzemni jezirka s modrozelenou, pruzracnou vodou. V
Listopadove jeskyni pak najdete prirodni unikat, nejvetsi podzemni
jezero v Cechach – Jezerni dom. Pri prohlidce je na chvili
zhasnuto osvetleni a v pritmi si muzete vychutnavat jeho
neopakovatelne kouzlo.
Pro uznani logu, odpovezte na otazky a splnte uvedeny ukol.
Krome hledani odpovedi to bude znamenat navstevu jeskyni a
fotografii na urcitem miste. Vstupne a poplatek za fotoaparat je
tedy nutnosti. Verim ale, ze navstevy nebudete litovat. Odpovezte
na nasledujici otazky:
1) DOLOMIT
a) Uvedte zakladni
fyzikalni a morfologicke vlastnosti nerostu – tvrdost,
hustotu a jaky vzhled maji krystaly.
b) Jak nerost prisel ke svemu
jmenu?
2) BOZKOVSKE JESKYNE
a) Ve kterem roce byly
jeskyne objeveny?
b) Jaka je teplota vzduchu
v jeskynich?
3) FOTOGRAFIE
Poridte svoji fotografii
priblizne na stejnem miste, jako je jedna ze dvou fotografii v
listingu (vy ovšem muzete vypadat lip ;-)
Fotografii pridavejte ke svemu logu, odpovedi na otazky
posilejte pres profil.
Diky a doufam, ze si prohlidku uzijete stejne jako pres dva
miliony dosavadnich navstevniku.
