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Rain and Snow, also known as Cold Rain and Snow (Roud 3634), is an American folksong and in some variants a murder ballad. The song first appeared in print in Olive Dame Campbell and Cecil Sharp's 1917 compilation English Folk Songs from the Southern Appalachians, which relates that it was collected from Mrs. Tom Rice in Big Laurel, North Carolina ...
Calcium hydroxide, traditionally called slaked lime, is an inorganic compound with the chemical formula Ca(OH)2. It is a colorless crystal or white powder and is obtained when calcium oxide (called lime or quicklime) is mixed, or "slaked" with water. ...
Biochemical oxygen demand is the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period ...
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