شرح ساينس الصف الخامس الابتدائي لغات - الفصل الدراسي الثاني
شرح ساينس خامسة ابتدائي - ترم ثاني

لينك تحميل الملزمة
https://drive.google.com/file/d/15ZLfbN_RUH_cT5258yBikCv0GMIbXhV3/view?usp=sharing

لينك تليجرام
https://t.me/mrahmedelbashagroup

In This Lesson:
There are many things we use every day that are made from natural resources, so it is very important to conserve these resources.
Example:
Paper is made from trees.
Plastic is made from oil products.
Clothes are made from plant such as cotton and animal products such as wool of sheep.

Humans can conserve natural resources in different ways such as:
1. Preservation. 2. Sustainability.

Preservation
Example of resources preservation:
Countries prevent using or developing of natural resources in some protected areas of land such as :
- Ras Mohammed Protectorate in South Sinai.
- Wadi Al-Hitan Protectorate in Fayoum.

Sustainability
• Sustainability is an important way of resources conservation.
• Sustainability means using resources in a way that does not negatively affect the future supply of these resources.

Example of resources sustainability :

Renewable does not mean unlimited.

Examples:
- When fresh water (renewable resource) on Earth is polluted, it becomes undrinkable.

- Pollution from burning of nonrenewable resources like coal and oil leads to soil pollution that causes the death of plants and animals (renewable resources).

- Cutting down too many trees (renewable resource) leads to deforestation so, water and wind can carry away soil causing soil erosion.
 
How Much Water Do You Use?
The following tables show how you can calculate the average amount of water that a person use in some daily activities by two different methods:


The following table shows the average of total amount of water used by a family formed of 4 members:

From the previous tables we can observe that many people use much water in their daily activities so, we must conserve water during our daily activities by changing our habits such as:
- Decrease the time of some activities like taking a shower.
- Turn off water during some activities like brushing teeth.

بالتوفيق
مستر احمد الباشا