Synthetic materials are made by applying chemical processes to natural resources. One example of a synthetic material is concrete.

Question

wet concrete mixture flowing down a chute into a bucket
pouring concrete into a bucket
Concrete is a widely used building material. Concrete is made by mixing together cement, crushed rocks, sand, and water. The cement is made from limestone and clay minerals. When the cement is mixed with crushed rocks, sand, and water, a chemical reaction occurs. The resulting substance is concrete!
Which natural resources are used to make concrete? Select all that apply.

Answer 1

The natural resources used to make concrete include:

1. Limestone - used to produce cement.
2. Clay minerals - also used to produce cement.
3. Crushed rocks - aggregate used in the concrete mixture.
4. Sand - another aggregate used in the concrete mixture.
5. Water - necessary for the chemical reaction to occur and to mix the ingredients.

So, the correct selections are limestone, clay minerals, crushed rocks, sand, and water.