Question

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.

Answer 1

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

Answer 2

Answer:

the answer is D

Explanation: