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Meghna Thapar 5 years, 6 months ago
A dam is a large wall or barrier that blocks or stops the flow of water, forming a reservoir or a lake. Most dams have a section called a spillway or weir over which, or through which, water flows, either sometimes or always. Three common types of concrete dams are: gravity, buttress and arch. Gravity: Concrete gravity dams are the most common form of concrete dam. The mass weight of concrete and friction resist the reservoir water pressure.
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Meghna Thapar 5 years, 6 months ago
Non-metals are organic substances that do not conduct heat or electricity, and are structurally brittle (cannot be easily rolled, molded, extruded or pressed). Chemically, the non-metallic elements in the periodic table are hydrogen, carbon, nitrogen, oxygen, phosphorus, sulfur, and selenium. In modern periodic table there are 22 non-metals in which there are 11 gases, 1 liquid and 10 solid. Bromine occurs in the state of liquid and hydrogen, nitrogen, oxygen, chlorine etc are found in gaseous forms. But carbon, sulphur, phosphorous, iodine etc solid non-metals.
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Riddhima Rewaria 7 years, 4 months ago
2Thank You