Earth's Wind | Grade 6 | Unit 3 - Concept 1 - Lesson 4 | Science

شرح ساينس الصف السادس الابتدائي لغات - الفصل الدراسي الثاني
شرح ساينس سادسة ابتدائي - ترم ثاني
لينك تحميل الملزمة
drive.google.com/file/d/1pzfX...
لينك تليجرام
t.me/mrahmedelbashagroup
In This Lesson:
In this activity, we will do an experiment to show how convection and gravity force affect the water cycle.
Tools
Steps
1. Fill one jar completely with hot water and fill the other jar completely with cold water.
2. Add yellow food coloring to the hot water and blue food coloring to the cold water.
3. Place the jar of hot water in the tub.
4. Cover the jar of cold water with thin plastic sheet.
5. Turn the jar of cold water upside down and place it on the top of the jar of hot water, where the openings of the two jars are touching and separating by the thin plastic sheet (case 1)).
6. Remove the thin plastic sheet gently.
What do you observe ?
Observation
The yellow and blue water are mixed producing green color.
7. Repeat the steps by placing the jar of cold water at the bottom and the jar of hot water at the top (case 2). What do you observe?
Observation
The yellow and blue water don't mix.
Explanation
• Convection currents are the reason for:
- Mixing of water in (case 1), where the hot water molecules (less density) rise upward, while the colder water molecules (more density) fall down by the help of gravity force.
- Not mixing of water in (case 2), where the less dense hot water molecules are at the top and the more dense colder water molecules are at the bottom, so mixing doesn't occur.
Conclusion
Convection currents and gravity force affect the movement of water through the water cycle.
Earth's Wind
▌Earth has a global wind system that consists of winds below in a constant direction over long
periods of time.
▌Wind is a main factor in determining weather and climate.
▌Daily weather conditions depend on wind, where it carries heat, moisture, rain, snow,
dust, sand, ... etc.
▌So, the change in wind causes change in weather.
▌Unequal heating of the Earth between the poles and equator generates wind.
▌Wind helps in transporting water through water cycle by carrying water vapor or by forming of ocean currents.
► What are the factors that determine the wind direction?
1. Amount of solar radiation that reach the Earth.
2. Rotation of the Earth
 How does wind form?
• Wind is generated when the warm air rises upward by the effect of sun's radiation and it is replaced by cooler air that flows from nearby areas, where:
What would happen if there were no wind on Earth?
• The regions around the equator become extremely hot and the poles will completely freeze.
• Some ecosystems will change completely.
• Some ecosystems may disappear completely.
بالتوفيق
مستر احمد الباشا