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Krš:
Krš je izraz koji se koristi za nadzemne i podzemne oblike reljefa koji su nastali trošenjem otopine u karbonatnim stijenama. Većina špilja u Hrvatskoj nastala je u vapnencu koji je najpopularnija karbonatna stijena.
Sedra:
Fontanu čine naslage sedre. Sedri je za nastanak potrebna voda koja sadrži kiselu vodu (ugljičnu kiselinu) i stijene koje sadrže vapnenac. Kamenac se otopi kiselom vodom i voda ga nosi stazom. Kada voda dođe do površine, tada se mijenja okoliš i vapno se taloži na površini kao stijena koja se naziva sedra. Postoje neke pojave formacija sedre kao što su: terase, poput vodopada ili poput kamenog oluka.
Sedra se formira tamo gdje krška voda dospijeva na površinu. Voda H2O i ugljikov dioksid CO2 zajedno grade H2CO3. Posljednji otapa vapno iz stijena koji se otapa u vodi s Ca(HCO3)2. Ca(HCO3)2 je deset puta lakše rastvorljiv u vodi nego CaCO3.
Zadatci za logiranje:
1. Opišite oblik i boju sedra.
2. Koliko dugo je trebalo da naraste do ove visine?
3. Koja biljka je pomogla u rastu ove fontane?
4. Uz vašu prijavu priložite fotografiju Vas, Vašeg GPS-a ili nadimka napisanog na papiru, dlanu, majici i slično.
Odgovore pošaljite preko profila na geocaching.com, a NE u Vašem logu! Ne morate čekati na potvrđivanje odgovora. Jednom kada pošaljete odgovore slobodno logirajte pronalazak ovog EarthCachea. Ako odgovori budu pogrešni mi ćemo kontaktirati Vas.
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Karst::
Karst is a term used for over- and underground landforms which were formed by solution-weathering in carbonate rock. Most of the caves in Croatia were formed in limestone which is the most popular carbonate rock.
Tufa:
The fountain is formed by tufa deposits. Tufa needs water which contains acidic water (carbon acid) and rock containing limestone for its formation. The limestone is solved by the acidic water and the water carries it along the trail. When the water reaches the surface, then the environment changes and the lime deposits at the surface as the rock called tufa. There are some appearances of tufa formations like: Terraces, like a waterfall or like a stone gutter.
Tufa is formed where karstic water reaches the surface. Water H2O and carbon dioxide CO2 together construct H2CO3. The last one solves the lime out of the rocks who solves in water with Ca(HCO3)2. Ca(HCO3)2 is ten times more easy to solve in water than CaCO3.
Logging tasks:
1. Describe formation and colour of tufa deposits at the fountain.
2. How long did it take to grow up to this height.?
3. Which plant do you think accelerated the formation of this fountain?
4. Attach a photo of you, your GPS or nickname written on paper, palm, t-shirt, etc.
Send answers via profile on geocaching.com, NOT in your log! You do not have to wait for your answers to be confirmed. Once you submit your answers feel free to log this EarthCache as found. If your answers are wrong we will contact you.
