(Photo: Elkhorn Slough NERRS site). An estuary is a partially enclosed body of water, and its surrounding coastal habitats, where saltwater from the ocean mixes with fresh water from rivers or streams. In fresh water the concentration of salts, or salinity, is nearly zero.The salinity of water in the ocean averages about 35 parts per thousand (ppt).ruly, no two estuaries are the same. Yet they are typically classified based on two characteristics: their geology and how saltwater and fresh water mix in them. However, not all estuaries contain brackish waters. There are a small number of ecosystems classified as freshwater estuaries.
Plug Type F. Used in: Germany, Austria, the Netherlands and Spain among others (see complete list of countries on the right) The Type F electrical plug (also known as a Schuko plug) has two 4.8 mm round pins spaced 19 mm apart. It is similar to the Type E plug but has two earth clips on the side rather than a female earth contact.
Converters and transformers both step up or down the voltage, but there is a difference in use between them. Converters should be used only with âelectricâ products. Electric products are simple heating devices or have mechanical motors. Examples are hair dryers, steam irons, shavers, toothbrushes or small fans.ransformers and converters only convert the voltage, not the frequency. The difference in cycles may cause the motor in a 50 Hz appliance to operate slightly faster when used on 60 Hz electricity.