national monument. noun. Definition of national monument for English Language Learners. : a place (such as an old building or an area of land) that is owned and protected by a national government because of its natural beauty or its importance to history or science. Britannica.com: Encyclopedia article about national monument.
Brown or discolored water is caused by minerals, sediment, or rust that may accumulate in the water mains over time. When the water from your tap is brown this indicates a disturbance in the water main that stirs up these deposits.
Hard water stains are deposits of minerals (usually calcium) that form on porcelain or metal faucets. These usually occur when there is an abundance of minerals in your drinking water, causing these chalky, white stains that are impossible to get rid of.