A covering (usually of cloth) that serves as a roof to shelter an area from the weather.
Canvas is an extremely heavy-duty plain-woven fabric used for making sails, tents, marquees, backpacks, and other functions where sturdiness is required.
Concrete is a construction material that consists of cement as well as other cementitious materials such as fly ash and slag cement, aggregate (generally a coarse aggregate such as gravel limestone or granite, plus a fine aggregate such as sand or manufactured ...
