Exercise Writing Task 1 We can see in the diagrams how the cement is produced and how the concrete ir made based on the cement. Firstly, the limestone and the clay are crushed ina specific machine, than the resultant powder is mixed. In the next stage, the mixture goes to a rotating heater and after that to a grinder where the process is finished: the cement is finally ready. Than, the product is packed and goes to the stories. When the cement arrives at the building, it is time to produce concrete. In a concrete mixer, all the ingredients are mixed. The first one is the cement, produced as we said before, in a porcentage of 15% of the mixture. Than we put 10% of water, 25% of sand and 50% of gravel which is a type of small stones. When all the features have already been mixed, the concrete is ready to be used in the building process. *** This is an exercise for an exam. I should describe two diagrams. One of them shows cement-making process and the other how cement is used to produce concrete.