Dripstone Cave
Dripstone may refer to: *Hood mould or dripstone, an architectural feature for handling rain water * Dripstone, a type of speleothem (cave formation) that includes for example stalactites * Dripstone, a type of water filter made of porous stone * Dripstone, New South Wales Dripstone is a locality in Dubbo Regional Council, New South Wales, Australia Australia, officially the Commonwealth of Australia, is a sovereign country comprising the mainland of the Australian continent, the island of Tasmania, an ...

Hood Mould
In architecture, a hood mould, hood, label mould (from Latin ''labia'', lip), drip mould or dripstone, is an external moulded projection from a wall over an opening to throw off rainwater, historically often in form of a ''pediment''. This moulding can be terminated at the side by ornamentation called a ''label stop''. The hood mould was introduced into architecture in the Romanesque period, though they became much more common in the Gothic period. Later, with the increase in rectangular windows they became more prevalent in domestic architecture. Styles of hood moulding File:IMG 0817 - Perugia - Finestra - Foto G. Dall'Orto - 6 ago 2006 - 01.jpg, Circular hood moulding File:StBeesSchoolMusicBlock.JPG, Rectangular hood mouldings on a rendered Victorian building File:Mercer House 2017.jpg, Every window of the Mercer House in Savannah, Georgia, is crowned with a cast-iron hood moulding File:Magdalene College SCR Window.jpg, Tudor-style hood mould ending in decorative label stops, ...
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Speleothem
A speleothem (; ) is a geological formation by mineral deposits that accumulate over time in natural caves. Speleothems most commonly form in calcareous caves due to carbonate dissolution reactions. They can take a variety of forms, depending on their depositional history and environment. Their chemical composition, gradual growth, and preservation in caves make them useful paleoclimatic proxies. Chemical and physical characteristics More than 300 variations of cave mineral deposits have been identified. The vast majority of speleothems are calcareous, composed of calcium carbonate (CaCO3) minerals ( calcite or aragonite). Less commonly, speleothems are made of calcium sulfate ( gypsum or mirabilite) or opal. Speleothems of pure calcium carbonate or calcium sulfate are translucent and colorless. The presence of iron oxide or copper provides a reddish brown color. The presence of manganese oxide can create darker colors such as black or dark brown. Speleothems can also be br ...
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Water Filter
A water filter removes impurities by lowering contamination of water using a fine physical barrier, a chemical process, or a biological process. Filters cleanse water to different extents, for purposes such as: providing agricultural irrigation, accessible drinking water, public and private aquariums, and the safe use of ponds and swimming pools. Methods of filtration Filters use sieving, adsorption, ion exchanges, biofilms and other processes to remove unwanted substances from water. Unlike a sieve or screen, a filter can potentially remove particles much smaller than the holes through which its water passes, such as Nitrates or germs like ''Cryptosporidium.'' Among the methods of filtration, notable examples are sedimentation, used to separate hard and suspended solids from water and activated charcoal treatment, where the boiled water is poured through a piece of cloth to trap undesired residuals. Additionally, the use of machinery to work on desalinization and purificati ...
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