Farming the Desert | Grade 6 | Unit 3 - Concept 2 - Lesson 1 | Science

شرح ساينس الصف السادس الابتدائي لغات - الفصل الدراسي الثاني
شرح ساينس سادسة ابتدائي - ترم ثاني

لينك تحميل الملزمة
https://drive.google.com/file/d/1rR1j...

لينك تليجرام
https://t.me/mrahmedelbashagroup

In This Lesson:
▌The extreme hot and dry climate of desert makes farming difficult, so farmers had to adapt this climate and work to develop some ways to benefit from the small amount of water.
▌Farmers face a challenge in farming deserts because more water evaporates than that falls by precipitation.

Improving the soil of deserts:
Population growth causes more people to live in desert, so farmers use new ways to make the soil of dry desert fertile and fruitful, for example:
• They improve the soil quality.
• They plant crops that are able to grow in the hot climate and low-fertility soil.
• They use new ways to irrigate crops, such as reusing water.
• They use wind and the Sun to power their farms in desert with wind turbines or solar energy.

Mountain effects:
• Mountain ranges at coastal regions often have two sides:
- A wet side (that faces the coast).
- A dry side (that is away from the coast).
Now, we will describe a process that causes a phenomenon on both sides of coastal mountain ranges known as the "rain shadow".

Rain shadow phenomenon:
• At the wet side that faces the coast:
- When warm and humid air encounters (faces) this side of a mountain range, so this air rises and cools.
- Water vapor in the cold air condenses, so precipitation occurs.
• At the dry side that is away from the coast:
The air descends and becomes warm, so this air dries the land of this side.

Changes in the atmosphere:
The following table shows comparison between the properties of the atmosphere at the top of a mountain with the properties of the atmosphere at the bottom of the mountain:

The properties At the bottom of the mountain At the top of the mountain
The atmospheric pressure: High. Low.
The air temperature: High. Low.
The air density: High. Low.

From the previous table we can conclude that the atmospheric pressure (air pressure), air temperature and air density decrease as we go from the bottom of the mountain to its top.


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