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Colourful Lakelets
Colourful lakelets (Polish "Kolorowe Jeziorka") is the name of three (sometimes four) artificial ponds formed in place of former mines at the slope of Wielka Kopa mountain (871 m) in Rudawy Janowickie, range in Sudetes Mountains, Poland. The biggest one and the oldest (1785) was named Hoffnung Grube and now hosts the Purple lakelet. Names of the other mines were: Neues Glück (1793, presently Azure Lakelet), and Gustav Grube (1796; the Green Lakelet). These places were mined from 1785 to 1925 for pyrite. The lakelets have various surface elevation. The Purple lakelet (560 m) owes its colour to chemical composition of its banks and bottom which are abundant with iron compounds, mainly pyrite. The pond is filled with water solution of sulphuric acid (pH = 3). It is highly recommended to avoid any contact with the water for it might be dangerous. Below Purple Lakelet there is a smaller hollow which is at times filled with waters falling from the pond above – it is called Yellow L ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pond
A pond is an area filled with water, either natural or artificial, that is smaller than a lake. Defining them to be less than in area, less than deep, and with less than 30% emergent vegetation helps in distinguishing their ecology from that of lakes and wetlands.Clegg, J. (1986). Observer's Book of Pond Life. Frederick Warne, London Ponds can be created by a wide variety of natural processes (e.g. on floodplains as cutoff river channels, by glacial processes, by peatland formation, in coastal dune systems, by beavers), or they can simply be isolated depressions (such as a kettle hole, vernal pool, prairie pothole, or simply natural undulations in undrained land) filled by runoff, groundwater, or precipitation, or all three of these. They can be further divided into four zones: vegetation zone, open water, bottom mud and surface film. The size and depth of ponds often varies greatly with the time of year; many ponds are produced by spring flooding from rivers. Ponds may b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
