شرح ساينس الصف الخامس الابتدائي لغات مستر احمد الباشا
ساينس خامسة ابتدائي

لينك تحميل الملزمة
https://drive.google.com/file/d/1CT3lLprXjaxXmhbqtDcwOCO-KHve_qre/view?usp=sharing

لينك تليجرام
https://t.me/mrahmedelbashagroup

In this part :
Humans use some strategies to control and conserve fresh water for their needs such as:
- building dams across rivers.
- diverting (changing) the path of water to irrigate crops.
Watershed
It is an area of land where water from different sources flows towards a common location usually an ocean, a sea or other large water body.
The study of freshwater systems focuses on the balance of water in a watershed, where:
- When there is more rainfall, the level of water in rivers or streams will increase
causing floods.
- When there is too little rainfall, the level of water in rivers or streams will decrease, so these water bodies may dry up causing drought.
• But, when there is water balance, rivers or streams will have a constant source of
fresh water.

Tributaries
They are small water bodies such as small creeks or streams that flow into bigger rivers.

As you have studied before that water bodies are connected with each other, we can conclude that:
We are going to use the following figure that represents a watershed map to show how water bodies will be affected by some human activities that occur nearer to upstream and downstream such as

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