1. The History of concrete. By Mr. Clark

2. When in Rome When in Rome

3. Some of the oldest structures in the world are made from concrete

4. Fact concrete helped build the the pyramids

5. Concrete is even used for slides.

6. Built the Hoover Dam

7. This is why we use concrete.

8. Fact Concrete was used in building the pyramids and might be the first known use of the material. There was 4.5 million cubic yards of concrete used to build the Hoover dam. Many of the structures built by the Romans are still standing today. Some structures were built over 2,00 years ago. The Willis tower/also known as sears tower was built in 1973 and was the tallest building in the world. UNTIL?

9. Tallest building in the world!!!!

10. Burj Khalifa The tallest building in the reaches to an amazing high of 2,725 feet. This building cost 1.5 billion dollars to build.