The diagram shows the process of how concrete is produced for building purposes.

Overall, it is a simple process that requires four main ingredients. These materials are mixed together in a specific machine called a concrete mixer to create the final product.

First, the four ingredients are measured by percentages before being mixed. Gravel, which is small stones, makes up the largest part of the mixture at 50%. Next, sand is added, accounting for exactly 25%. Cement is the third material, making up 15% of the total. Finally, a small amount of water, which is only 10%, is poured into the combination.

After all the materials are collected, they are put into the concrete mixer. This machine rotates continuously to mix everything together well, and then the concrete is ready to use.