Ms. Hadeer Mohamed
Grade 6
Mob.: 01121457565
Concept 4.2 – Lesson 4
Second Term
Reducing water pollution:
• Human activities can negatively affect the environment which affects living organisms.
• The human population is constantly increasing. (What happen)
that leads to increasing the number of industries that use water and also increasing the rate of
water pollution.
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►Methods of reducing water pollution:
There are many other ways to reduce water pollution such as:
7. Applying laws is the most
effective way to prevent water
pollution.
Note:
Preventing water pollution is more effective than cleaning up pollution from water that
requires a lot of time and effort.
Traditional bricks
► Human like all living organisms need shelter to survive, so he uses soil to build homes but
the processes of making building materials (bricks and cement) can cause pollution that
damage the environment.
Harms of traditional bricks and concrete:
• Soil scientists and engineers hope to stop depending on traditional bricks and concrete (G.R)
because they consume huge amounts of wood and coal during making them, so they cause
harms for the environment, where:
-The soil is changed chemically
into bricks that must be
burned at more than 1000°C.
-The ingredients of cement
must be burned at 1450°C.
• So, the manufacture of bricks and cement requires a lot of energy and produces a lot of
pollution.
Using soil to build sustainable homes:
• Scientists transform soil into building materials, where they add chemicals to the soil that
turn the clay of soil into substance that looks like glue which bind the materials together.
• This glue-like substance is made by a chemical change of the soil.
• In this process, the scientists don't use the topsoil that is used for agriculture, but they use
the subsoil found beneath the topsoil and available around Earth.
• The new substance is used to build sustainable homes instead of the traditional bricks.