"Earth's Atmosphere" PPT

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Qingdao edition third grade science volume 2, Earth's atmosphere PPT

Part One: The atmosphere is all around us

We can feel the presence of the atmosphere at any time, such as: people breathe the air;

Phenomena such as clouds and rain constantly occur in the atmosphere;

Planes fly through the atmosphere;

Birds fly in the atmosphere...

Earth's atmosphere PPT, part 2: atmosphere

1. There is an atmosphere on the surface of the earth

The earth is surrounded by a very thick layer of air. The air layer surrounding the earth is called the atmosphere, and the air is also called the atmosphere.

The atmosphere is mainly concentrated at a height of about 1,000 kilometers above the ground.

The atmosphere appears very thin compared to the radius of the Earth.

2. Composition of the atmosphere

Nitrogen, oxygen, carbon dioxide, rare gases, ozone, water vapor and solid impurities suspended in it.

The role of the three atmospheres: 3.1

1. Various gases in the atmosphere are indispensable resources (provide resources) for human beings (for example: oxygen is necessary for life activities; carbon dioxide is an important raw material for photosynthesis)

2. Water vapor and dust can form clouds and cause rain, causing various weather changes.

3. Insulation to reduce the temperature difference between day and night

4. The ozone layer can protect living things on the ground from the sun’s ultraviolet rays.

5. Protect the earth, such as avoiding meteor attacks

Earth's atmosphere PPT, the third part: look at the pictures and learn the text

Talk about it

(1) What do the vertical and horizontal axes in the figure represent?

(2) What is the change pattern of temperature as altitude increases?

Temperature increases with altitude

Temperature decreases with increasing altitude

Temperature increases with altitude

Temperature decreases with increasing altitude

Why do we need to keep warm when going hiking?

Living in the area of ​​0-12 kilometers, the atmospheric temperature only decreases with increasing height. When climbing, the higher a person climbs, the lower the atmospheric temperature.

What about altitude sickness?

High altitude, thin air, lack of oxygen

Earth's atmosphere PPT, part 4 content: The importance of the atmosphere:

1. Protect the earth from meteorite collisions and reduce the temperature difference between day and night.

2. Various gases in the atmosphere are indispensable resources for human beings

3. The ozone layer can protect living things on the ground from the sun’s ultraviolet rays.

4. Water vapor can form clouds and cause rain, causing various weather phenomena.

5. It is the medium for sound transmission

In short: the atmosphere is very important to humans, protecting the earth like a "coat". Without the atmosphere there would be no life, and there are many beautiful scenery we would not be able to see.

Earth's atmosphere PPT, Part 5: Atmospheric pollution

With the rapid development of human society's production and life, various pollutants have entered the earth's atmosphere in large quantities. This is what people call "air pollution."

Car exhaust - the exhaust gas emitted by cars is the main killer of the atmosphere

Discussion: How to prevent and control air pollution?

1. Carry out reasonable industrial layout;

2. Improve combustion equipment;

3. Improve the structural composition of fuel;

4. Treat pollutants in exhaust gas;

5. Plant trees.

The destruction of the ozone layer is the most serious form of air pollution, and it is also one of the focuses of concern for environmental workers. What are your thoughts on this hot topic?

Keywords: Qingdao version third grade science PPT courseware for the second volume free download, Earth’s atmosphere PPT download, .PPT format;

For more information about the "Earth's Atmosphere" PPT courseware, please click on the Earth's Atmosphere ppt tag.

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Update Time: 2024-11-22

This template belongs to science courseware Qingdao Edition Third Grade Science Volume 2 industry PPT template

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