Select the correct answer. Which category of materials does concrete belong to and why? A. It's a synthetic polymer because it's a product of a chemical reaction. B. It's an alloy because it contains layers of different components. C. It's a ceramic because it contains substances such as sand and clay. D. It's a composite because it's a mixture of cement, sand, and other granular pieces.

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18 December, 21:23

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Nicholson · Answer 1

the answer is D

Elise Evans · Answer 2

D. It's a composite because it's a mixture of cement, sand, and other granular pieces.