امتحان ساينس Science شامل - الوحدة 3 -الصف الخامس

The Job of ........... is design tools that provide us with clean water

When fresh water polluted .it becomes ............ 

........... leads to soil pollution that causes death of plants and animals.

.............  They are stations which recycle waste water by removing harmful materials from wastewater to reuse it

............  removing harmful materials from water

We can conserve water by Recycling water.

You can make clean water by adding mud to clear water.

Non - renewable such as  ...........

Renewable resources can be used up if people don’t use them wisely.

...........A building established across a river which can hold water behind it