The diagram below shows the process by which bricks are manufactured for the building industry. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The picture illustrates the procedure for producing construction

bricks

from clay, sand and water through ten rather simple stages. It commences when raw clay is dug using a digger machine following which it is sifted through a metal grid into finer fragments which

then

fall onto a conveyor belt. In the next stage, water and sand are added and the resulting mixture is either pushed through a frame and cut into simple

bricks

,

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or

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moulded into specially-formed

bricks

. These are

then

placed in a special oven for two to three days in order to minimise their moisture content. The following three stages involve the use of a couple of kilns and a cooling chamber:

bricks

are first heated moderately in the first kiln to reach a temperature of between 200 and 980 degrees centigrade before being subjected to higher temperatures (870 to 1300 degrees) in the second one.

Next,

they are allowed to cool down for two to three days in the cooling chamber. The process ends with the

bricks

being packed on pallets and delivered to end users on trucks.