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.
What Causes Blue Stains? Blue stains in shower, tub or sink fixtures, are in the vast majority of cases, a result of household water that has a low pH. So, what is pH, you might ask. pH is a measure of how much acidity water has. The lower the pH your water has, the more acidic itâs become.