"Atmosphere" PPT courseware

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"Atmosphere" PPT courseware

Part 1: Step-by-step learning of the atmosphere

1. Thickness of the atmosphere:

If the whole apple is viewed as an earth

This layer of apple skin is equivalent to the atmosphere around the earth

The atmosphere is mainly concentrated at an altitude of about 1,000 kilometers above the ground

2. Composition of the atmosphere:

Nitrogen, oxygen, carbon dioxide, ozone, rare gases, water vapor and solid impurities, etc.

Do you know what materials the atmosphere is made of?

What is your basis?

3. The importance of atmosphere

1. Protective effect

2. Clouds make it rain

3. Provide oxygen

4. Adjust the temperature

In short, the atmosphere is very important to humans. It protects the earth like a "coat".

4. Atmospheric temperature:

Thinking: Are the atmospheric temperatures at different altitudes on the Earth the same?

Is the vertical distribution of atmospheric temperature regular?

The vertical distribution pattern of atmospheric temperature:

From 0 to 12 kilometers, the temperature gradually decreases;

From 12 to 50 kilometers, the temperature gradually increases;

From 50 to 85 kilometers, the temperature gradually decreases;

Above 85 kilometers, the temperature gradually increases.

Atmosphere PPT, Part 2: Classroom Exercises

1. If there was no atmosphere on the earth, _____ would still exist:

A． A violent storm B. thunder and lightning

C. Volcanic eruption D. blue sea, blue sky

2. The function of the atmosphere is ( ).

A． It is the earth's coat and protects the earth.

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

C. Absorbs most of the ultraviolet rays and protects organisms from ultraviolet damage.

D. All of the above.

3. You will feel it when climbing the mountain ( ).

A． The temperature is getting lower and lower, and the air is getting thinner and thinner

B. The temperature is getting higher and higher, and the air is getting denser and denser

C. The temperature is getting lower and lower, and the air is getting denser and denser

D. The temperature is getting higher and higher, and the air is getting thinner and thinner

Atmosphere PPT, Part 3: Troposphere

The troposphere is the bottom layer of the atmosphere. It is about 8 kilometers thick in the polar regions and increases to 17 to 18 kilometers at the equator. The troposphere concentrates 3/4 of the earth's atmospheric mass and almost all water vapor and solid impurities. The most significant feature is the strong convective motion.

The principle of liquid convection:

experiment one

1. Add an appropriate amount of water to a beaker and heat it with an alcohol lamp. Will the water in the beaker flow?

When the air is heated, does it flow like the water in the beaker?

Experiment 2

2. Light a piece of incense, insert it horizontally on the plasticine, turn a large beaker upside down on the table, place the incense in the middle, and the smoke from the incense.

Atmosphere PPT, part 4 content: exercises:

1. Affected by convection, the vertical movement of air in hot places is ________, and the vertical movement of air in cold places is ________.

2. Read the picture and complete the following questions:

(1) Fill in the name of the atmosphere:

A_______, B______

(2) The temperature change characteristics of layer A are:

(3) The temperature change characteristics of layer B are:

(4) Fill in the letters:

The atmosphere most closely related to humans is _______,

The atmosphere that is conducive to high-altitude flight of large jet airliners is ____,

The atmosphere with complex weather changes is _______,

Air with significant convective movement is _______.

Keywords: Zhejiang Education Edition eighth grade science PPT courseware free download, atmosphere PPT download, .PPT format;

For more information about the "Atmosphere" PPT courseware, please click the Atmosphere ppt tab.

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Update Time: 2024-11-17

This template belongs to science courseware Zhejiang Education Edition Eighth Grade Science Volume 1 industry PPT template

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