Cement is formed by strongly heating a mixture of A. Limestone and graphite B. Limestone and clay C. Chalk and graphite D. Clay and graphite

The correct answer is A. Limestone and clay.

Cement is a binding agent that is used to hold together other materials, such as sand and gravel, to form concrete. It is made by strongly heating a mixture of limestone and clay. The heat causes the limestone to decompose into calcium oxide and carbon dioxide, and the clay to decompose into silica, alumina, and iron oxide. These materials then react with each other to form cement clinker, which is ground into a powder and mixed with water to form

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